Vulnerability-Lookup

GHSA-3JF5-XC4H-MR9M

Vulnerability from github – Published: 2026-11-01 00:30 – Updated: 2026-11-01 00:30

Details

XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder.

Affected versions compile a bundled brotli into static archives that dependent XS modules link against at build time, rather than using the system library. The bundled copy, 1.0.7 or 1.1.0 across the range, carries the decoder out-of-bounds write described in CVE-2026-111497. Version 1.2.1.0 updates it to brotli 1.2.1.

XS::libbrotli has no Perl interface, so the decoder is reached through any dependent module that decompresses untrusted data with it. An attacker supplying a crafted brotli stream can corrupt decoder state, disclose memory, crash the process, or potentially execute arbitrary code. Upgrading the system brotli does not remediate this.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-115946"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-01T00:16:34Z",
    "severity": null
  },
  "details": "XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder.\n\nAffected versions compile a bundled brotli into static archives that dependent XS modules link against at build time, rather than using the system library. The bundled copy, 1.0.7 or 1.1.0 across the range, carries the decoder out-of-bounds write described in CVE-2026-111497. Version 1.2.1.0 updates it to brotli 1.2.1.\n\nXS::libbrotli has no Perl interface, so the decoder is reached through any dependent module that decompresses untrusted data with it. An attacker supplying a crafted brotli stream can corrupt decoder state, disclose memory, crash the process, or potentially execute arbitrary code. Upgrading the system brotli does not remediate this.",
  "id": "GHSA-3jf5-xc4h-mr9m",
  "modified": "2026-11-01T00:30:25Z",
  "published": "2026-11-01T00:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115946"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/brotli/releases/tag/v1.2.1"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/SYBER/XS-libbrotli-1.2.1.0/changes"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-111497"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-115946 (GCVE-0-2026-115946)

Vulnerability from cvelistv5 – Published: 2026-10-31 23:49 – Updated: 2026-10-31 23:49

Title

XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder

Summary

XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder. Affected versions compile a bundled brotli into static archives that dependent XS modules link against at build time, rather than using the system library. The bundled copy, 1.0.7 or 1.1.0 across the range, carries the decoder out-of-bounds write described in CVE-2026-111497. Version 1.2.1.0 updates it to brotli 1.2.1. XS::libbrotli has no Perl interface, so the decoder is reached through any dependent module that decompresses untrusted data with it. An attacker supplying a crafted brotli stream can corrupt decoder state, disclose memory, crash the process, or potentially execute arbitrary code. Upgrading the system brotli does not remediate this.

Severity

No CVSS data available.

CWE

CWE-1395 - Dependency on Vulnerable Third-Party Component

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 62/100 over 369 records in the last 180 days details

References

3 references

URL	Tags
https://www.cve.org/CVERecord?id=CVE-2026-111497	vendor-advisoryrelated
https://github.com/google/brotli/releases/tag/v1.2.1	release-notes
https://metacpan.org/release/SYBER/XS-libbrotli-1…	release-notes

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 1.2.1.0 (custom)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "XS::libbrotli"
          ],
          "packageName": "XS-libbrotli",
          "packageURL": "pkg:cpan/XS-libbrotli",
          "programFiles": [
            "brotli/c/dec/decode.c"
          ],
          "versions": [
            {
              "lessThan": "1.2.1.0",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder.\n\nAffected versions compile a bundled brotli into static archives that dependent XS modules link against at build time, rather than using the system library. The bundled copy, 1.0.7 or 1.1.0 across the range, carries the decoder out-of-bounds write described in CVE-2026-111497. Version 1.2.1.0 updates it to brotli 1.2.1.\n\nXS::libbrotli has no Perl interface, so the decoder is reached through any dependent module that decompresses untrusted data with it. An attacker supplying a crafted brotli stream can corrupt decoder state, disclose memory, crash the process, or potentially execute arbitrary code. Upgrading the system brotli does not remediate this."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1395",
              "description": "CWE-1395 Dependency on Vulnerable Third-Party Component",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-31T23:49:36.583Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "related"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-111497"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/google/brotli/releases/tag/v1.2.1"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/SYBER/XS-libbrotli-1.2.1.0/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to XS-libbrotli 1.2.1.0 or later and reinstall every XS module built against it."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-10-29T00:00:00.000Z",
          "value": "Version 1.2.1.0 released with fix."
        }
      ],
      "title": "XS::libbrotli versions before 1.2.1.0 for Perl bundle a brotli library with an out-of-bounds write in the decoder",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-115946",
    "datePublished": "2026-10-31T23:49:36.583Z",
    "dateReserved": "2026-10-23T23:40:26.063Z",
    "dateUpdated": "2026-10-31T23:49:36.583Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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.
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