Vulnerability-Lookup

CVE-2026-48207 (GCVE-0-2026-48207)

Vulnerability from cvelistv5 – Published: 2026-05-21 15:51 – Updated: 2026-05-21 18:37

Title

Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement

Summary

Deserialization of untrusted data in Apache Fory PyFory. PyFory's ReduceSerializer could bypass documented DeserializationPolicy validation hooks during reduce-state restoration and global-name resolution. An application is vulnerable if it deserializes attacker-controlled data using PyFory Python-native mode with strict mode disabled and relies on DeserializationPolicy to restrict unsafe classes, functions, or module attributes. This issue affects Apache Fory: from before 1.0.0. Mitigation: Users of Apache Fory are recommended to upgrade to version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue.

Severity

No CVSS data available.

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

apache

References

1 reference

URL	Tags
https://fory.apache.org/security/#cve-2026-48207-…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Fory	Affected: 0.13.0 , < 1.0.0 (semver)

Credits

Lide Wen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-48207

Vulnerability from fkie_nvd - Published: 2026-05-21 17:16 - Updated: 2026-05-21 19:16

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security@apache.org	https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/21/10

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Deserialization of untrusted data in Apache Fory PyFory. PyFory\u0027s ReduceSerializer could bypass documented DeserializationPolicy validation hooks during reduce-state restoration and global-name resolution. An application is vulnerable if it deserializes attacker-controlled data using PyFory Python-native mode with strict mode disabled and relies on DeserializationPolicy to restrict unsafe classes, functions, or module attributes.\n\nThis issue affects Apache Fory: from before 1.0.0.\n\nMitigation: Users of Apache Fory are recommended to upgrade to version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue."
    }
  ],
  "id": "CVE-2026-48207",
  "lastModified": "2026-05-21T19:16:53.700",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
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          "confidentialityImpact": "HIGH",
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          "version": "3.1"
        },
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        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    },
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      "url": "http://www.openwall.com/lists/oss-security/2026/05/21/10"
    }
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  "vulnStatus": "Undergoing Analysis",
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}

GHSA-M5GW-83W2-7749

Vulnerability from github – Published: 2026-05-21 18:33 – Updated: 2026-05-21 21:30

Details

This issue affects Apache Fory: from before 1.0.0.

Mitigation: Users of Apache Fory are recommended to upgrade to version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue.

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

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-48207"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-21T17:16:21Z",
    "severity": "CRITICAL"
  },
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  "id": "GHSA-m5gw-83w2-7749",
  "modified": "2026-05-21T21:30:33Z",
  "published": "2026-05-21T18:33:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48207"
    },
    {
      "type": "WEB",
      "url": "https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/21/10"
    }
  ],
  "schema_version": "1.4.0",
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    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-48207 (GCVE-0-2026-48207)

FKIE_CVE-2026-48207

GHSA-M5GW-83W2-7749

Tags

Sightings

Nomenclature