Common Weakness Enumeration

CWE-502

Allowed

Deserialization of Untrusted Data

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

5884 vulnerabilities reference this CWE, most recent first.

GHSA-GWFR-JFJF-92VV

Vulnerability from github – Published: 2026-05-05 21:29 – Updated: 2026-05-08 15:36
VLAI
Summary
Grav has Insecure Deserialization in File Cache
Details

Insecure Deserialization in File Cache

  • Severity: High
  • CWE: CWE-502
  • Location: system/src/Grav/Framework/Cache/Adapter/FileCache.php
  • Sink: unserialize($value, ['allowed_classes' => true])

Affected version(s)

  • Affected: >= 1.7.44 and <= 1.7.49.5 (verified in current codebase and changelog-covered releases).
  • Fixed: No upstream fix identified in the reviewed branch at the time of analysis.
  • Notes: Earlier 1.7.x releases may also be affected, but were not fully back-traced in this review.

Notes

allowed_classes => true allows object instantiation and does not constrain classes.

PoC (Primitive Demonstration)

Preconditions

  • Local PHP runtime.
  • Goal is to validate the deserialization primitive used in cache retrieval.

Steps

php -r '
class CacheWakeup { public function __wakeup(){ file_put_contents("/tmp/grav_filecache_poc.txt", "wakeup"); } }

$payload = serialize(new CacheWakeup());
unserialize($payload, ["allowed_classes" => true]);

echo file_exists("/tmp/grav_filecache_poc.txt") ? "FILECACHE_UNSERIALIZE_TRIGGERED\n" : "FILECACHE_UNSERIALIZE_NOT_TRIGGERED\n";
'

Expected Result

  • Output contains: FILECACHE_UNSERIALIZE_TRIGGERED.

Interpretation

This reproduces the same unsafe primitive used by FileCache::doGet(): unserialize($value, ['allowed_classes' => true]). If cache files are attacker-tampered, object magic methods may execute.

Exploit Preconditions

  • Cache file poisoning/tampering capability.

Recommendation

  • Avoid object deserialization in cache payloads.
  • Use non-object formats and integrity protection for cache files.

Maintainer note — fix applied (2026-04-24)

Fixed in Grav core on the 2.0 branch: commit c66dfeb5f — will ship in 2.0.0-beta.2.

What changed: Framework\Cache\Adapter\FileCache now HMAC-signs every cache payload with Security::getNonceKey() on write, and verifies the HMAC on read. Tampered, forged, or pre-upgrade files are treated as cache misses and unlinked instead of being unserialized. The on-disk format is now versioned:

v2
<expires>
<key>
<hmac-hex>
<serialized>

Existing caches rebuild transparently on first read. Note that Framework\Cache\Adapter\FileCache isn't wired into Grav's main cache path — Symfony's FilesystemAdapter is — but the class is reachable by plugin and downstream consumers, so the hardening applies defensively.

Files: - system/src/Grav/Framework/Cache/Adapter/FileCache.php. - tests/unit/Grav/Common/Security/FileCacheSecurityTest.php — round-trip, tampered-payload rejection, wrong-key forgery rejection, pre-v2 file rebuild, key-field mismatch.

Severity
5.0 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
1.3 (Low)
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.0-beta.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-7317"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T21:29:29Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "# Insecure Deserialization in File Cache\n\n- **Severity:** High \n- **CWE:** CWE-502\n- **Location:** `system/src/Grav/Framework/Cache/Adapter/FileCache.php`\n- **Sink:** `unserialize($value, [\u0027allowed_classes\u0027 =\u003e true])`\n\n## Affected version(s)\n\n- **Affected:** `\u003e= 1.7.44` and `\u003c= 1.7.49.5` (verified in current codebase and changelog-covered releases).\n- **Fixed:** No upstream fix identified in the reviewed branch at the time of analysis.\n- **Notes:** Earlier `1.7.x` releases may also be affected, but were not fully back-traced in this review.\n\n## Notes\n`allowed_classes =\u003e true` allows object instantiation and does not constrain classes.\n\n## PoC (Primitive Demonstration)\n\n### Preconditions\n- Local PHP runtime.\n- Goal is to validate the deserialization primitive used in cache retrieval.\n\n### Steps\n```bash\nphp -r \u0027\nclass CacheWakeup { public function __wakeup(){ file_put_contents(\"/tmp/grav_filecache_poc.txt\", \"wakeup\"); } }\n\n$payload = serialize(new CacheWakeup());\nunserialize($payload, [\"allowed_classes\" =\u003e true]);\n\necho file_exists(\"/tmp/grav_filecache_poc.txt\") ? \"FILECACHE_UNSERIALIZE_TRIGGERED\\n\" : \"FILECACHE_UNSERIALIZE_NOT_TRIGGERED\\n\";\n\u0027\n```\n\n### Expected Result\n- Output contains: `FILECACHE_UNSERIALIZE_TRIGGERED`.\n\n### Interpretation\nThis reproduces the same unsafe primitive used by `FileCache::doGet()`:\n`unserialize($value, [\u0027allowed_classes\u0027 =\u003e true])`.\nIf cache files are attacker-tampered, object magic methods may execute.\n\n## Exploit Preconditions\n- Cache file poisoning/tampering capability.\n\n## Recommendation\n- Avoid object deserialization in cache payloads.\n- Use non-object formats and integrity protection for cache files.\n\n\n\n---\n\n## Maintainer note \u2014 fix applied (2026-04-24)\n\nFixed in Grav core on the `2.0` branch: commit [`c66dfeb5f`](https://github.com/getgrav/grav/commit/c66dfeb5f) \u2014 will ship in **2.0.0-beta.2**.\n\n**What changed:** `Framework\\Cache\\Adapter\\FileCache` now HMAC-signs every cache payload with `Security::getNonceKey()` on write, and verifies the HMAC on read. Tampered, forged, or pre-upgrade files are treated as cache misses and unlinked instead of being unserialized. The on-disk format is now versioned:\n\n```\nv2\n\u003cexpires\u003e\n\u003ckey\u003e\n\u003chmac-hex\u003e\n\u003cserialized\u003e\n```\n\nExisting caches rebuild transparently on first read. Note that `Framework\\Cache\\Adapter\\FileCache` isn\u0027t wired into Grav\u0027s main cache path \u2014 Symfony\u0027s `FilesystemAdapter` is \u2014 but the class is reachable by plugin and downstream consumers, so the hardening applies defensively.\n\n**Files:**\n- [`system/src/Grav/Framework/Cache/Adapter/FileCache.php`](https://github.com/getgrav/grav/blob/2.0/system/src/Grav/Framework/Cache/Adapter/FileCache.php).\n- [`tests/unit/Grav/Common/Security/FileCacheSecurityTest.php`](https://github.com/getgrav/grav/blob/2.0/tests/unit/Grav/Common/Security/FileCacheSecurityTest.php) \u2014 round-trip, tampered-payload rejection, wrong-key forgery rejection, pre-v2 file rebuild, key-field mismatch.",
  "id": "GHSA-gwfr-jfjf-92vv",
  "modified": "2026-05-08T15:36:36Z",
  "published": "2026-05-05T21:29:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-gwfr-jfjf-92vv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7317"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/commit/c66dfeb5f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/devsamuelsantiago/grav-cms-filecache-object-injection"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getgrav/grav"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/798732"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/359965"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/359965/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Grav has Insecure Deserialization in File Cache"
}

GHSA-GWP4-HFV6-P7HW

Vulnerability from github – Published: 2019-08-01 19:18 – Updated: 2023-11-27 23:03
VLAI
Summary
Deserialization of untrusted data in FasterXML jackson-databind
Details

A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x before 2.9.9.2, 2.8.11.4, 2.7.9.6, and 2.6.7.3. This occurs when Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has the logback jar in the classpath.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.9.0"
            },
            {
              "fixed": "2.9.9.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.8.0"
            },
            {
              "fixed": "2.8.11.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.7.0"
            },
            {
              "fixed": "2.7.9.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.7.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2019-14439"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2019-08-01T15:37:50Z",
    "nvd_published_at": "2019-07-30T11:15:00Z",
    "severity": "HIGH"
  },
  "details": "A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x before 2.9.9.2, 2.8.11.4, 2.7.9.6, and 2.6.7.3. This occurs when Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has the logback jar in the classpath.",
  "id": "GHSA-gwp4-hfv6-p7hw",
  "modified": "2023-11-27T23:03:26Z",
  "published": "2019-08-01T19:18:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14439"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/issues/2389"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/commit/ad418eeb974e357f2797aef64aa0e3ffaaa6125b"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3@%3Ccommits.nifi.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/ee0a051428d2c719acfa297d0854a189ea5e284ef3ed491fa672f4be@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/f9bc3e55f4e28d1dcd1a69aae6d53e609a758e34d2869b4d798e13cc@%3Cissues.drill.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b@%3Ccommits.nifi.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2019/08/msg00011.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OVRZDN2T6AZ6DJCZJ3VSIQIVHBVMVWBL"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TXRVXNRFHJSQWFHPRJQRI5UPMZ63B544"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/bugtraq/2019/Oct/6"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20190814-0001"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2019/dsa-4542"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2020.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujul2020.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/b0656d359c7d40ec9f39c8cc61bca66802ef9a2a12ee199f5b0c1442@%3Cdev.drill.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/940b4c3fef002461b89a050935337056d4a036a65ef68e0bbd4621ef@%3Cdev.struts.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/87e46591de8925f719664a845572d184027258c5a7af0a471b53c77b@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/5fc0e16b7af2590bf1e97c76c136291c4fdb244ee63c65c485c9a7a1@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/5ecc333113b139429f4f05000d4aa2886974d4df3269c1dd990bb319@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/56c8042873595b8c863054c7bfccab4bf2c01c6f5abedae249d914b9@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f@%3Cdev.drill.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/3f99ae8dcdbd69438cb733d745ee3ad5e852068490719a66509b4592@%3Ccommits.cassandra.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/34717424b4d08b74f65c09a083d6dd1cb0763f37a15d6de135998c1d@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/2d2a76440becb610b9a9cb49b15eac3934b02c2dbcaacde1000353e4@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/0d4b630d9ee724aee50703397d9d1afa2b2befc9395ba7797d0ccea9@%3Cdev.tomee.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/compare/jackson-databind-2.9.9.1...jackson-databind-2.9.9.2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/FasterXML/jackson-databind"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2019:3200"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Deserialization of untrusted data in FasterXML jackson-databind"
}

GHSA-GWV6-PQ6M-P3RQ

Vulnerability from github – Published: 2026-05-18 12:31 – Updated: 2026-05-29 17:23
VLAI
Summary
SGLanG: Multimodal scheduler deserializes untrusted pickle data on 0.0.0.0 ROUTER socket
Details

SGLang's multimodal generation runtime scheduler's ROUTER socket binds to 0.0.0.0 by default and contains a sink that calls pickle.loads() on incoming messages, enabling RCE when exposed to the internet.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sglang"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.5.5"
            },
            {
              "last_affected": "0.5.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-7301"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-29T17:23:09Z",
    "nvd_published_at": "2026-05-18T12:16:16Z",
    "severity": "CRITICAL"
  },
  "details": "SGLang\u0027s multimodal generation runtime scheduler\u0027s ROUTER socket binds to 0.0.0.0 by default and contains a sink that calls pickle.loads() on incoming messages, enabling RCE when exposed to the internet.",
  "id": "GHSA-gwv6-pq6m-p3rq",
  "modified": "2026-05-29T17:23:09Z",
  "published": "2026-05-18T12:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7301"
    },
    {
      "type": "WEB",
      "url": "https://antiproof.ai/blog/three-rces-in-sglang"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sgl-project/sglang"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sgl-project/sglang/tree/main/python/sglang"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SGLanG: Multimodal scheduler deserializes untrusted pickle data on 0.0.0.0 ROUTER socket"
}

GHSA-GWVW-V6HG-775R

Vulnerability from github – Published: 2022-05-13 01:32 – Updated: 2022-05-13 01:32
VLAI
Details

Buck parser-cache command loads/saves state using Java serialized object. If the state information is maliciously crafted, deserializing it could lead to code execution. This issue affects Buck versions prior to v2018.06.25.01.

Severity
9.8 (Critical)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2018-6331"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-12-31T23:29:00Z",
    "severity": "CRITICAL"
  },
  "details": "Buck parser-cache command loads/saves state using Java serialized object. If the state information is maliciously crafted, deserializing it could lead to code execution. This issue affects Buck versions prior to v2018.06.25.01.",
  "id": "GHSA-gwvw-v6hg-775r",
  "modified": "2022-05-13T01:32:03Z",
  "published": "2022-05-13T01:32:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-6331"
    },
    {
      "type": "WEB",
      "url": "https://github.com/facebook/buck/commit/8c5500981812564877bd122c0f8fab48d3528ddf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GWW7-P5W4-WRFV

Vulnerability from github – Published: 2020-03-04 20:52 – Updated: 2024-03-15 00:52
VLAI
Summary
Deserialization of Untrusted Data in jackson-databind
Details

FasterXML jackson-databind 2.x before 2.6.7.4, 2.7.x before 2.7.9.7, 2.8.x before 2.8.11.5, and 2.9.x before 2.9.10.2 lacks certain net.sf.ehcache blocking.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.6.7.3"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.6.7.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.7.9.6"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.7.0"
            },
            {
              "fixed": "2.7.9.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.8.11.4"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.8.0"
            },
            {
              "fixed": "2.8.11.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.9.10.1"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.9.0"
            },
            {
              "fixed": "2.9.10.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2019-20330"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-02-25T02:46:33Z",
    "nvd_published_at": "2020-01-03T04:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "FasterXML jackson-databind 2.x before 2.6.7.4, 2.7.x before 2.7.9.7, 2.8.x before 2.8.11.5, and 2.9.x before 2.9.10.2 lacks certain `net.sf.ehcache` blocking.",
  "id": "GHSA-gww7-p5w4-wrfv",
  "modified": "2024-03-15T00:52:58Z",
  "published": "2020-03-04T20:52:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20330"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/issues/2526"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/commit/eb254813cc822d0af015ce8fe05febf50721dc53"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/commit/fc4214a883dc087070f25da738ef0d49c2f3387e"
    },
    {
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      "url": "https://lists.apache.org/thread.html/r909c822409a276ba04dc2ae31179b16f6864ba02c4f9911bdffebf95@%3Cissues.zookeeper.apache.org%3E"
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    },
    {
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      "url": "https://lists.apache.org/thread.html/rfa57d9c2a27d3af14c69607fb1a3da00e758b2092aa88eb6a51b6e99@%3Cissues.zookeeper.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/02/msg00020.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20200127-0004"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujul2020.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/FasterXML/jackson-databind"
    },
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      "url": "https://github.com/FasterXML/jackson-databind/compare/jackson-databind-2.9.10.1...jackson-databind-2.9.10.2"
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      "url": "https://lists.apache.org/thread.html/r5c3644c97f0434d1ceb48ff48897a67bdbf3baf7efbe7d04625425b3@%3Ccommits.druid.apache.org%3E"
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      "url": "https://lists.apache.org/thread.html/r5d3d10fdf28110da3f9ac1b7d08d7e252f98d7d37ce0a6bd139a2e4f@%3Cissues.zookeeper.apache.org%3E"
    },
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    },
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      "url": "https://lists.apache.org/thread.html/r707d23bb9ee245f50aa909add0da6e8d8f24719b1278ddd99d2428b2@%3Cissues.zookeeper.apache.org%3E"
    },
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      "url": "https://lists.apache.org/thread.html/r7a0821b44247a1e6c6fe5f2943b90ebc4f80a8d1fb0aa9a8b29a59a2@%3Ccommits.zookeeper.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r7fb123e7dad49af5886cfec7135c0fd5b74e4c67af029e1dc91ba744@%3Ccommits.druid.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r8831b7fa5ca87a1cf23ee08d6dedb7877a964c1d2bd869af24056a63@%3Ccommits.zookeeper.apache.org%3E"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Deserialization of Untrusted Data in jackson-databind"
}

GHSA-GX2X-4JJF-6WF2

Vulnerability from github – Published: 2025-05-19 21:30 – Updated: 2026-04-01 18:35
VLAI
Details

Deserialization of Untrusted Data vulnerability in Potenzaglobalsolutions CiyaShop allows Object Injection.This issue affects CiyaShop: from n/a through 4.18.0.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-39349"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-19T20:15:22Z",
    "severity": "CRITICAL"
  },
  "details": "Deserialization of Untrusted Data vulnerability in Potenzaglobalsolutions CiyaShop allows Object Injection.This issue affects CiyaShop: from n/a through 4.18.0.",
  "id": "GHSA-gx2x-4jjf-6wf2",
  "modified": "2026-04-01T18:35:13Z",
  "published": "2025-05-19T21:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39349"
    },
    {
      "type": "WEB",
      "url": "https://patchstack.com/database/wordpress/theme/ciyashop/vulnerability/wordpress-ciyashop-theme-4-18-0-php-object-injection-vulnerability?_s_id=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GX5Q-2VPF-G2W4

Vulnerability from github – Published: 2022-12-12 18:30 – Updated: 2022-12-14 21:30
VLAI
Details

The Cooked Pro WordPress plugin before 1.7.5.7 does not properly validate or sanitize the recipe_args parameter before unserializing it in the cooked_loadmore action, allowing an unauthenticated attacker to trigger a PHP Object injection vulnerability.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-3900"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-12-12T18:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "The Cooked Pro WordPress plugin before 1.7.5.7 does not properly validate or sanitize the recipe_args parameter before unserializing it in the cooked_loadmore action, allowing an unauthenticated attacker to trigger a PHP Object injection vulnerability.",
  "id": "GHSA-gx5q-2vpf-g2w4",
  "modified": "2022-12-14T21:30:17Z",
  "published": "2022-12-12T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-3900"
    },
    {
      "type": "WEB",
      "url": "https://wpscan.com/vulnerability/c969c4bc-82d7-46a0-88ba-e056c0b27de7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GX65-C5HJ-VPV5

Vulnerability from github – Published: 2026-08-25 03:32 – Updated: 2026-09-02 14:40
Withdrawn 2026-09-02 VLAI
Summary
Duplicate Advisory: [CWE-502] Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution
Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-rhp5-r9x4-f5g2. This link is maintained to preserve external references.

Original Description

NLTK before 3.10.0 (affected versions <=3.9.4) contains an unsafe pickle deserialization vulnerability in the TransitionParser.parse() method (nltk/parse/transitionparser.py). The method calls pickle_load() with the default restricted=False, routing deserialization through WarningUnpickler, which does not override find_class() and therefore permits arbitrary class resolution. When an application loads an attacker-crafted model file, embedded pickle gadget chains execute arbitrary Python code with the privileges of the user running the application. NLTK provides a RestrictedUnpickler for safe deserialization, but it is not used by production code paths. Fixed in 3.10.0.

Severity
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "nltk"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.9.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-02T14:40:50Z",
    "nvd_published_at": "2026-08-25T02:16:53Z",
    "severity": "CRITICAL"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-rhp5-r9x4-f5g2. This link is maintained to preserve external references.\n\n## Original Description\nNLTK before 3.10.0 (affected versions \u003c=3.9.4) contains an unsafe pickle deserialization vulnerability in the TransitionParser.parse() method (nltk/parse/transitionparser.py). The method calls pickle_load() with the default restricted=False, routing deserialization through WarningUnpickler, which does not override find_class() and therefore permits arbitrary class resolution. When an application loads an attacker-crafted model file, embedded pickle gadget chains execute arbitrary Python code with the privileges of the user running the application. NLTK provides a RestrictedUnpickler for safe deserialization, but it is not used by production code paths. Fixed in 3.10.0.",
  "id": "GHSA-gx65-c5hj-vpv5",
  "modified": "2026-09-02T14:40:50Z",
  "published": "2026-08-25T03:32:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nltk/nltk/security/advisories/GHSA-rhp5-r9x4-f5g2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78683"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nltk-before-remote-code-execution-via-unsafe-pickle-deserialization"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Duplicate Advisory: [CWE-502] Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution",
  "withdrawn": "2026-09-02T14:40:50Z"
}

GHSA-GX6W-FQG7-MC3P

Vulnerability from github – Published: 2023-06-14 15:30 – Updated: 2023-06-26 18:30
VLAI
Details

An issue was discovered jackson-databind thru 2.15.2 allows attackers to cause a denial of service or other unspecified impacts via crafted object that uses cyclic dependencies.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2023-35116"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502",
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-14T14:15:10Z",
    "severity": null
  },
  "details": "An issue was discovered jackson-databind thru 2.15.2 allows attackers to cause a denial of service or other unspecified impacts via crafted object that uses cyclic dependencies.",
  "id": "GHSA-gx6w-fqg7-mc3p",
  "modified": "2023-06-26T18:30:26Z",
  "published": "2023-06-14T15:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-35116"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/issues/3972"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GX83-3VF8-GH7J

Vulnerability from github – Published: 2026-09-28 20:44 – Updated: 2026-09-28 20:44
VLAI
Summary
jackson-databind: Comparable missing from DefaultBaseTypeLimitingValidator's unsafe base types (incomplete PolymorphicTypeValidator denylist)
Details

Summary

DefaultBaseTypeLimitingValidator — the PolymorphicTypeValidator used automatically whenever @JsonTypeInfo is applied without an explicitly configured custom validator — denies polymorphic resolution only for nine specific "unsafe base types" (Object, Serializable, Closeable, AutoCloseable, Cloneable, Runnable, java.util.logging.Handler, javax.naming.Referenceable, javax.sql.DataSource). Its isSafeSubType() returns true unconditionally for every other base type. java.lang.Comparable is not in that list, despite being implemented by a very large fraction of JDK and application classes — comparable in breadth to Serializable, which is denylisted for exactly that reason. An application with an @JsonTypeInfo-annotated Comparable-typed property, and no custom validator configured, will accept a type identifier for essentially any class implementing Comparable.

Details

Affected file: src/main/java/tools/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java

private final static class UnsafeBaseTypes {
    private final Set<String> UNSAFE = new HashSet<>();
    {
        UNSAFE.add(Object.class.getName());
        UNSAFE.add(java.io.Closeable.class.getName());
        UNSAFE.add(java.io.Serializable.class.getName());
        UNSAFE.add(AutoCloseable.class.getName());
        UNSAFE.add(Cloneable.class.getName());
        UNSAFE.add(Runnable.class.getName());          // [databind#5014]
        UNSAFE.add("java.util.logging.Handler");
        UNSAFE.add("javax.naming.Referenceable");
        UNSAFE.add("javax.sql.DataSource");
        // java.lang.Comparable is NOT present here
    }
}

protected boolean isSafeSubType(DatabindContext ctxt,
        JavaType baseType, JavaType subType) {
    return true;   // unconditional for every base type not in UNSAFE
}

The class's own JavaDoc acknowledges the design ("Note that when using potentially unsafe base type like java.lang.Object a custom implementation... is needed"), so the trade-off of leaving broad base types unrestricted is intentional. The gap is that Comparable has the same breadth of implementers as the types this class does restrict, and its absence looks like an oversight rather than a deliberate choice — consistent with the ongoing, incremental nature of this list (Runnable was added recently for issue #5014).

This is specific to the default, unconfigured validator reached via bare @JsonTypeInfo usage. Global "Default Typing" via activateDefaultTyping() is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument — a correctly-configured BasicPolymorphicTypeValidator rejects the same payload under activateDefaultTyping().

PoC

Built entirely from source (jackson-databind + jackson-core + jackson-annotations, javac, OpenJDK 21, no third-party gadget libraries, no network access):

1. Sanity check (benign class, confirms the mechanism fires):

static class SafeThing implements Comparable<SafeThing> {
    public String name;
    public SafeThing() {}
    public int compareTo(SafeThing o) { return 0; }
}
static class Holder {
    @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS)
    public Comparable<?> value;
}

ObjectMapper mapper = JsonMapper.builder().build();   // no custom PTV
String json = "{\"value\":{\"@class\":\"...SafeThing\",\"name\":\"hello\"}}";
Holder h = mapper.readValue(json, Holder.class);
// RESULT: ACCEPTED, class=...SafeThing

2. Real JDK class substitution:

String json = "{\"value\":[\"java.io.File\",\"/etc/passwd\"]}";
Holder h = mapper.readValue(json, Holder.class);
// RESULT: ACCEPTED, class=java.io.File value=/etc/passwd

3. Negative control — Default Typing with an explicit custom PTV:

PolymorphicTypeValidator ptv = BasicPolymorphicTypeValidator.builder()
    .allowIfSubType("PtvGapTest4").build();
ObjectMapper mapper = JsonMapper.builder()
    .activateDefaultTyping(ptv, DefaultTyping.NON_FINAL).build();
// same java.io.File payload
// RESULT: REJECTED - InvalidTypeIdException: "...denied resolution"

Observed output:

$ java -cp .:build/classes PtvGapTest3 Trying: {"value":["java.io.File","/etc/passwd"]} ACCEPTED, class=java.io.File value=/etc/passwd

$ java -cp .:build/classes PtvGapTest4 Trying malicious substitution: ["PtvGapTest4$Holder",{"value":["java.io.File","/etc/passwd"]}] REJECTED - InvalidTypeIdException: Could not resolve type id 'java.io.File' as a subtype of java.lang.Comparable: Configured PolymorphicTypeValidator denied resolution

Impact

Any application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, without a separately configured restrictive PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. Concrete impact is demonstrated via java.io.File: an attacker can cause construction of a File object for an arbitrary, attacker-chosen path. On its own this is a controlled-object-instantiation primitive; if the application later calls path-sensitive or mutating methods on the received value, this becomes a path-traversal-adjacent primitive.

Suggested remediation: 1. Add java.lang.Comparable to UnsafeBaseTypes.UNSAFE. 2. Audit other broad JDK interfaces (java.lang.Iterable, java.util.EventListener) for the same gap. 3. Consider a narrower default for isSafeSubType() for base types outside the fixed denylist, rather than unconditional true.

Severity
5.6 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "tools.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "tools.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.2.0"
            },
            {
              "fixed": "3.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.11.0"
            },
            {
              "fixed": "2.18.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.19.0"
            },
            {
              "fixed": "2.21.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.fasterxml.jackson.core:jackson-databind"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.22.0"
            },
            {
              "fixed": "2.22.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-83557"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502",
      "CWE-915"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-28T20:44:25Z",
    "nvd_published_at": "2026-09-01T15:17:37Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n`DefaultBaseTypeLimitingValidator` \u2014 the `PolymorphicTypeValidator` used automatically whenever `@JsonTypeInfo` is applied without an explicitly configured custom validator \u2014 denies polymorphic resolution only for nine specific \"unsafe base types\" (`Object`, `Serializable`, `Closeable`, `AutoCloseable`, `Cloneable`, `Runnable`, `java.util.logging.Handler`, `javax.naming.Referenceable`, `javax.sql.DataSource`). Its `isSafeSubType()` returns `true` unconditionally for every other base type. `java.lang.Comparable` is not in that list, despite being implemented by a very large fraction of JDK and application classes \u2014 comparable in breadth to `Serializable`, which is denylisted for exactly that reason. An application with an `@JsonTypeInfo`-annotated `Comparable`-typed property, and no custom validator configured, will accept a type identifier for essentially any class implementing `Comparable`.\n\n### Details\n**Affected file:** `src/main/java/tools/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java`\n\n```java\nprivate final static class UnsafeBaseTypes {\n    private final Set\u003cString\u003e UNSAFE = new HashSet\u003c\u003e();\n    {\n        UNSAFE.add(Object.class.getName());\n        UNSAFE.add(java.io.Closeable.class.getName());\n        UNSAFE.add(java.io.Serializable.class.getName());\n        UNSAFE.add(AutoCloseable.class.getName());\n        UNSAFE.add(Cloneable.class.getName());\n        UNSAFE.add(Runnable.class.getName());          // [databind#5014]\n        UNSAFE.add(\"java.util.logging.Handler\");\n        UNSAFE.add(\"javax.naming.Referenceable\");\n        UNSAFE.add(\"javax.sql.DataSource\");\n        // java.lang.Comparable is NOT present here\n    }\n}\n\nprotected boolean isSafeSubType(DatabindContext ctxt,\n        JavaType baseType, JavaType subType) {\n    return true;   // unconditional for every base type not in UNSAFE\n}\n```\n\nThe class\u0027s own JavaDoc acknowledges the design (*\"Note that when using potentially unsafe base type like `java.lang.Object` a custom implementation... is needed\"*), so the trade-off of leaving broad base types unrestricted is intentional. The gap is that `Comparable` has the same breadth of implementers as the types this class *does* restrict, and its absence looks like an oversight rather than a deliberate choice \u2014 consistent with the ongoing, incremental nature of this list (`Runnable` was added recently for issue #5014).\n\nThis is specific to the **default, unconfigured validator** reached via bare `@JsonTypeInfo` usage. Global \"Default Typing\" via `activateDefaultTyping()` is **not** affected, because that method structurally requires an explicit `PolymorphicTypeValidator` argument \u2014 a correctly-configured `BasicPolymorphicTypeValidator` rejects the same payload under `activateDefaultTyping()`.\n\n### PoC\nBuilt entirely from source (jackson-databind + jackson-core + jackson-annotations, `javac`, OpenJDK 21, no third-party gadget libraries, no network access):\n\n**1. Sanity check (benign class, confirms the mechanism fires):**\n```java\nstatic class SafeThing implements Comparable\u003cSafeThing\u003e {\n    public String name;\n    public SafeThing() {}\n    public int compareTo(SafeThing o) { return 0; }\n}\nstatic class Holder {\n    @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS)\n    public Comparable\u003c?\u003e value;\n}\n\nObjectMapper mapper = JsonMapper.builder().build();   // no custom PTV\nString json = \"{\\\"value\\\":{\\\"@class\\\":\\\"...SafeThing\\\",\\\"name\\\":\\\"hello\\\"}}\";\nHolder h = mapper.readValue(json, Holder.class);\n// RESULT: ACCEPTED, class=...SafeThing\n```\n\n**2. Real JDK class substitution:**\n```java\nString json = \"{\\\"value\\\":[\\\"java.io.File\\\",\\\"/etc/passwd\\\"]}\";\nHolder h = mapper.readValue(json, Holder.class);\n// RESULT: ACCEPTED, class=java.io.File value=/etc/passwd\n```\n\n**3. Negative control \u2014 Default Typing with an explicit custom PTV:**\n```java\nPolymorphicTypeValidator ptv = BasicPolymorphicTypeValidator.builder()\n    .allowIfSubType(\"PtvGapTest4\").build();\nObjectMapper mapper = JsonMapper.builder()\n    .activateDefaultTyping(ptv, DefaultTyping.NON_FINAL).build();\n// same java.io.File payload\n// RESULT: REJECTED - InvalidTypeIdException: \"...denied resolution\"\n```\n\n**Observed output:**\n\n\n\n\n$ java -cp .:build/classes PtvGapTest3\nTrying: {\"value\":[\"java.io.File\",\"/etc/passwd\"]}\nACCEPTED, class=java.io.File value=/etc/passwd\n\n$ java -cp .:build/classes PtvGapTest4\nTrying malicious substitution: [\"PtvGapTest4$Holder\",{\"value\":[\"java.io.File\",\"/etc/passwd\"]}]\nREJECTED - InvalidTypeIdException: Could not resolve type id \u0027java.io.File\u0027 as a\nsubtype of java.lang.Comparable: Configured PolymorphicTypeValidator denied resolution\n\n\n\n\n### Impact\nAny application declaring an `@JsonTypeInfo`-annotated property or class with `Comparable` as its base type, without a separately configured restrictive `PolymorphicTypeValidator`, will accept a type identifier for essentially any class implementing `Comparable`. Concrete impact is demonstrated via `java.io.File`: an attacker can cause construction of a `File` object for an arbitrary, attacker-chosen path. On its own this is a controlled-object-instantiation primitive; if the application later calls path-sensitive or mutating methods on the received value, this becomes a path-traversal-adjacent primitive. \n\n**Suggested remediation:**\n1. Add `java.lang.Comparable` to `UnsafeBaseTypes.UNSAFE`.\n2. Audit other broad JDK interfaces (`java.lang.Iterable`, `java.util.EventListener`) for the same gap.\n3. Consider a narrower default for `isSafeSubType()` for base types outside the fixed denylist, rather than unconditional `true`.",
  "id": "GHSA-gx83-3vf8-gh7j",
  "modified": "2026-09-28T20:44:25Z",
  "published": "2026-09-28T20:44:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83557"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/issues/6156"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/pull/6155"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/commit/eb3b7fc0f9c0d27f471550ac3316b17d1987388f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/FasterXML/jackson-databind"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.18.10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.21.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-2.22.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-3.1.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FasterXML/jackson-databind/releases/tag/jackson-databind-3.2.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "jackson-databind: Comparable missing from DefaultBaseTypeLimitingValidator\u0027s unsafe base types (incomplete PolymorphicTypeValidator denylist)"
}
Mitigation
Architecture and Design Implementation

If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.

Mitigation
Implementation

When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.

Mitigation
Implementation

Explicitly define a final object() to prevent deserialization.

Mitigation
Architecture and Design Implementation
  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Mitigation
Implementation

Avoid having unnecessary types or gadgets (a sequence of instances and method invocations that can self-execute during the deserialization process, often found in libraries) available that can be leveraged for malicious ends. This limits the potential for unintended or unauthorized types and gadgets to be leveraged by the attacker. Add only acceptable classes to an allowlist. Note: new gadgets are constantly being discovered, so this alone is not a sufficient mitigation.

Mitigation
Architecture and Design Implementation

Employ cryptography of the data or code for protection. However, it's important to note that it would still be client-side security. This is risky because if the client is compromised then the security implemented on the client (the cryptography) can be bypassed.

Mitigation MIT-29
Operation

Strategy: Firewall

Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].

CAPEC-586: Object Injection

An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.

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