Vulnerability-Lookup

CVE-2026-106453 (GCVE-0-2026-106453)

Vulnerability from cvelistv5 – Published: 2026-10-06 19:54 – Updated: 2026-10-07 17:07

Title

yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError

Summary

yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ4DecompressorWithLength uses getDecompressedLength to trust the four-byte decompressed-length header before validating the compressed input, allowing a five-byte attacker-supplied input whose header declares a large output size to request up to approximately 2 GiB and exhaust the JVM heap. Convenience overloads backed by LZ4FastDecompressor or LZ4SafeDecompressor allocate the untrusted size, while overloads that write to a caller-provided destination buffer are not affected because the caller controls the destination size. This issue is fixed in version 1.11.2.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-07 15:39 UTC

CWE

CWE-789 - Memory Allocation with Excessive Size Value

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7580 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/yawkat/lz4-java/security/advis…	x_refsource_CONFIRM
https://github.com/yawkat/lz4-java/commit/6492ce5…	x_refsource_MISC
https://github.com/yawkat/lz4-java/releases/tag/v1.11.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
yawkat	lz4-java	Affected: < 1.11.2	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-106453

Vulnerability from fkie_nvd - Published: 2026-10-06 20:17 - Updated: 2026-10-07 17:16

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/yawkat/lz4-java/commit/6492ce5aca6bd03ff9e08ee18a2beb94c431371a
	security-advisories@github.com	https://github.com/yawkat/lz4-java/releases/tag/v1.11.2
	security-advisories@github.com	https://github.com/yawkat/lz4-java/security/advisories/GHSA-6cx8-rjf8-pr8g

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "lz4-java",
          "vendor": "yawkat",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.11.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
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    {
      "lang": "en",
      "value": "yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ4DecompressorWithLength uses getDecompressedLength to trust the four-byte decompressed-length header before validating the compressed input, allowing a five-byte attacker-supplied input whose header declares a large output size to request up to approximately 2 GiB and exhaust the JVM heap. Convenience overloads backed by LZ4FastDecompressor or LZ4SafeDecompressor allocate the untrusted size, while overloads that write to a caller-provided destination buffer are not affected because the caller controls the destination size. This issue is fixed in version 1.11.2."
    }
  ],
  "id": "CVE-2026-106453",
  "lastModified": "2026-10-07T17:16:48.007",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
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}

GHSA-6CX8-RJF8-PR8G

Vulnerability from github – Published: 2026-10-07 16:17 – Updated: 2026-10-07 16:17

Summary

yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError

Details

Summary

LZ4DecompressorWithLength.decompress(byte[], int) allocates whatever size the 4-byte length header declares, before it reads a single byte of compressed data. A 5-byte input whose header says 0x40000000 makes the JVM commit a gigabyte and can cause heap exhaustion.

Details

net.jpountz.lz4.LZ4DecompressorWithLength reads the header and passes it straight on:

final int destLen = getDecompressedLength(src, srcOff);
return fastDecompressor.decompress(src, srcOff + 4, destLen);

and net.jpountz.lz4.LZ4FastDecompressor allocates it:

public final byte[] decompress(byte[] src, int srcOff, int destLen) {
  final byte[] decompressed = new byte[destLen];
  decompress(src, srcOff, decompressed, 0, destLen);
  return decompressed;
}

getDecompressedLength performs no validation: no comparison against src.length, no ceiling, no rejection of negatives. LZ4SafeDecompressor.decompress(byte[], int, int, int) has the same shape with maxDestLen.

The sibling overload that callers pass their own buffer to, decompress(src, srcOff, dest, destOff, destLen), is fine, because there destLen is chosen by the caller rather than by the input. The bug is specific to the convenience overloads that take the size from the header, and that difference is the whole finding.

Impact

Any application that decompresses attacker-supplied LZ4 frames through the with-length convenience API can be made to allocate up to 2 GiB per call from a 5-byte message. On a service that decompresses request bodies, a few concurrent 5-byte requests exhaust the heap. No privileges are needed, only the ability to get bytes into the decompressor. Confidentiality and integrity are untouched.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.11.1"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "at.yawk.lz4:lz4-java"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.lz4:lz4-java"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-106453"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-789"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T16:17:47Z",
    "nvd_published_at": "2026-10-06T20:17:27Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\n`LZ4DecompressorWithLength.decompress(byte[], int)` allocates whatever size the 4-byte length header declares, before it reads a single byte of compressed data. A 5-byte input whose header says `0x40000000` makes the JVM commit a gigabyte and can cause heap exhaustion.\n\n### Details\n\n`net.jpountz.lz4.LZ4DecompressorWithLength` reads the header and passes it straight on:\n\n```java\nfinal int destLen = getDecompressedLength(src, srcOff);\nreturn fastDecompressor.decompress(src, srcOff + 4, destLen);\n```\n\nand `net.jpountz.lz4.LZ4FastDecompressor` allocates it:\n\n```java\npublic final byte[] decompress(byte[] src, int srcOff, int destLen) {\n  final byte[] decompressed = new byte[destLen];\n  decompress(src, srcOff, decompressed, 0, destLen);\n  return decompressed;\n}\n```\n\n`getDecompressedLength` performs no validation: no comparison against `src.length`, no ceiling, no rejection of negatives. `LZ4SafeDecompressor.decompress(byte[], int, int, int)` has the same shape with `maxDestLen`.\n\nThe sibling overload that callers pass their own buffer to, `decompress(src, srcOff, dest, destOff, destLen)`, is fine, because there `destLen` is chosen by the caller rather than by the input. The bug is specific to the convenience overloads that take the size from the header, and that difference is the whole finding.\n\n### Impact\n\nAny application that decompresses attacker-supplied LZ4 frames through the with-length convenience API can be made to allocate up to 2 GiB per call from a 5-byte message. On a service that decompresses request bodies, a few concurrent 5-byte requests exhaust the heap. No privileges are needed, only the ability to get bytes into the decompressor. Confidentiality and integrity are untouched.",
  "id": "GHSA-6cx8-rjf8-pr8g",
  "modified": "2026-10-07T16:17:48Z",
  "published": "2026-10-07T16:17:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-6cx8-rjf8-pr8g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106453"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yawkat/lz4-java/commit/6492ce5aca6bd03ff9e08ee18a2beb94c431371a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/yawkat/lz4-java"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yawkat/lz4-java/releases/tag/v1.11.2"
    }
  ],
  "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:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError"
}

UBUNTU-CVE-2026-106453 (CVE-2026-106453)

Vulnerability from osv_ubuntu – Published: 2026-10-07 00:00 – Updated: 2026-10-07 00:00 – Source website

Details

(yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ ...)

Severity

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-106453	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-106453	REPORT
	https://github.com/yawkat/lz4-java/security/advis…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblz4-java",
            "binary_version": "1.5.1-2"
          },
          {
            "binary_name": "liblz4-jni",
            "binary_version": "1.5.1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "lz4-java",
        "purl": "pkg:deb/ubuntu/lz4-java@1.5.1-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblz4-java",
            "binary_version": "1.5.1-3build1"
          },
          {
            "binary_name": "liblz4-jni",
            "binary_version": "1.5.1-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "lz4-java",
        "purl": "pkg:deb/ubuntu/lz4-java@1.5.1-3build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.1-3build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblz4-java",
            "binary_version": "1.8.0-4build1"
          },
          {
            "binary_name": "liblz4-jni",
            "binary_version": "1.8.0-4build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "lz4-java",
        "purl": "pkg:deb/ubuntu/lz4-java@1.8.0-4build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.0-3",
        "1.8.0-4",
        "1.8.0-4build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblz4-java",
            "binary_version": "1.8.0-4build2"
          },
          {
            "binary_name": "liblz4-jni",
            "binary_version": "1.8.0-4build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "lz4-java",
        "purl": "pkg:deb/ubuntu/lz4-java@1.8.0-4build2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.0-4build1",
        "1.8.0-4build2"
      ]
    }
  ],
  "aliases": [],
  "details": "(yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ ...)",
  "id": "UBUNTU-CVE-2026-106453",
  "modified": "2026-10-07T00:00:00Z",
  "published": "2026-10-07T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-106453"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-106453"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-6cx8-rjf8-pr8g"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-106453"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-106453 (GCVE-0-2026-106453)

FKIE_CVE-2026-106453

GHSA-6CX8-RJF8-PR8G

Summary

Details

Impact

UBUNTU-CVE-2026-106453 (CVE-2026-106453)

Tags

Sightings

Nomenclature

Related by attack behaviour