hsec-2025-0003

Vulnerability from osv_haskell

Published

2025-11-14 14:45

Modified

2025-11-14 14:45

Summary

Use after free in multithreaded lzma (.xz) decoder

Details

Use after free in multithreaded lzma (.xz) decoder

In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash (CVE-2025-31115). The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected.

The Haskell xz-clib library vendors and builds the C implementation. The xz package does not use the multithreaded decoder and is therefore unaffected.

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2025/HSEC-2025-0003.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2025/HSEC-2025-0003.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "xz-clib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.3"
            },
            {
              "fixed": "5.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-31115"
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# Use after free in multithreaded lzma (.xz) decoder\n\nIn XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in\nliblzma has a bug where invalid input can at least result in a crash\n(CVE-2025-31115). The effects include heap use after free and\nwriting to an address based on the null pointer plus an offset.\nApplications and libraries that use the `lzma_stream_decoder_mt`\nfunction are affected.\n\nThe Haskell *xz-clib* library vendors and builds the C\nimplementation.  The *xz* package does not use the multithreaded\ndecoder and is therefore unaffected.\n",
  "id": "HSEC-2025-0003",
  "modified": "2025-11-14T14:45:34Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "ARTICLE",
      "url": "https://tukaani.org/xz/threaded-decoder-early-free.html"
    },
    {
      "type": "FIX",
      "url": "https://github.com/tukaani-project/xz/commit/d5a2ffe41bb77b918a8c96084885d4dbe4bf6480"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hasufell/lzma-static/commit/e95fe96530568addfc83b771900025053e2c6951"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Use after free in multithreaded lzma (.xz) decoder"
}

CVE-2025-31115 (GCVE-0-2025-31115)

Vulnerability from cvelistv5 – Published: 2025-04-03 16:57 – Updated: 2025-04-03 20:03

Title

XZ has a heap-use-after-free bug in threaded .xz decoder

Summary

XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6, v5.8, and master branches in the xz Git repository. No new release packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases.

Severity ?

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-366 - Race Condition within a Thread
CWE-416 - Use After Free
CWE-476 - NULL Pointer Dereference
CWE-826 - Premature Release of Resource During Expected Lifetime

Assigner

GitHub_M

References

URL

Tags

	https://github.com/tukaani-project/xz/security/ad…	x_refsource_CONFIRM
	https://github.com/tukaani-project/xz/commit/d5a2…	x_refsource_MISC
	https://tukaani.org/xz/xz-cve-2025-31115.patch	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	tukaani-project	xz	Affected: >= 5.3.3alpha, < 5.8.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-31115",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-03T17:57:35.541572Z",
                "version": "2.0.3"
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              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-03T17:58:59.148Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
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        "providerMetadata": {
          "dateUpdated": "2025-04-03T20:03:09.458Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "http://www.openwall.com/lists/oss-security/2025/04/03/1"
          },
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            "url": "http://www.openwall.com/lists/oss-security/2025/04/03/2"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/04/03/3"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "xz",
          "vendor": "tukaani-project",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.3.3alpha, \u003c 5.8.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
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          "value": "XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6, v5.8, and master branches in the xz Git repository. No new release packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases."
        }
      ],
      "metrics": [
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            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
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            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
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      "problemTypes": [
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        },
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              "lang": "en",
              "type": "CWE"
            }
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        },
        {
          "descriptions": [
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              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-826",
              "description": "CWE-826: Premature Release of Resource During Expected Lifetime",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
        {
          "name": "https://github.com/tukaani-project/xz/security/advisories/GHSA-6cc8-p5mm-29w2",
          "tags": [
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          ],
          "url": "https://github.com/tukaani-project/xz/security/advisories/GHSA-6cc8-p5mm-29w2"
        },
        {
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          "tags": [
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        },
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          "tags": [
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          "url": "https://tukaani.org/xz/xz-cve-2025-31115.patch"
        }
      ],
      "source": {
        "advisory": "GHSA-6cc8-p5mm-29w2",
        "discovery": "UNKNOWN"
      },
      "title": "XZ has a heap-use-after-free bug in threaded .xz decoder"
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  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2025-04-03T16:57:05.488Z",
    "dateReserved": "2025-03-26T15:04:52.624Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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

hsec-2025-0003

Vulnerability from osv_haskell

Use after free in multithreaded lzma (.xz) decoder

CVE-2025-31115 (GCVE-0-2025-31115)

Tags

Sightings

Nomenclature