BREW-EXTRACT_URL-CVE-2026-8829 (CVE-2026-8829)

Vulnerability from osv_homebrew – Published: 2026-08-13 09:25 – Updated: 2026-08-13 09:25 – Source website
VLAI
Summary
HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities
Details

HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities.

The XS routine backing HTML::Entities::_decode_entities cached a pointer (repl) into the entity-value SV returned by hv_fetch on the entity2char hash. When the input SV was identical to a value SV in that hash, and that value contained its own key as an entity reference, a later call to grow_gap() reallocated the SV's PV buffer and freed the backing allocation that repl still pointed into. The subsequent copy loop read repl_len bytes from the freed allocation.

The read may disclose adjacent heap contents into the destination SV.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": null,
        "range_state": "affected",
        "resource": "HTML::Parser",
        "resource_purl": "pkg:cpan/OALDERS/HTML-Parser@3.83",
        "upstream_fixed_in": "3.84"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "extract_url",
        "purl": "pkg:brew/extract_url"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "medium",
    "source": "matched",
    "strategy": "cpansa",
    "upstream_evidence": [
      {
        "ecosystem": "CPAN",
        "key": "pkg:cpan/OALDERS/HTML-Parser@3.83",
        "name": "HTML-Parser",
        "resource": "HTML::Parser",
        "strategy": "cpansa",
        "subject_version": "3.83"
      }
    ]
  },
  "details": "HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities.\n\nThe XS routine backing HTML::Entities::_decode_entities cached a pointer (repl) into the entity-value SV returned by hv_fetch on the entity2char hash. When the input SV was identical to a value SV in that hash, and that value contained its own key as an entity reference, a later call to grow_gap() reallocated the SV\u0027s PV buffer and freed the backing allocation that repl still pointed into. The subsequent copy loop read repl_len bytes from the freed allocation.\n\nThe read may disclose adjacent heap contents into the destination SV.",
  "id": "BREW-extract_url-CVE-2026-8829",
  "modified": "2026-08-13T09:25:25Z",
  "published": "2026-08-13T09:25:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/06/04/2"
    },
    {
      "type": "WEB",
      "url": "https://cpan.org/modules"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2026/06/msg00044.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8829.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8829"
    },
    {
      "type": "FIX",
      "url": "https://github.com/libwww-perl/HTML-Parser/commit/6922552b0778c90a9587a3894e248be4d3a25e1c.patch"
    },
    {
      "type": "FIX",
      "url": "https://github.com/libwww-perl/HTML-Parser/pull/56"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/libwww-perl/HTML-Parser"
    }
  ],
  "schema_version": "1.7.3",
  "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": "HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities",
  "upstream": [
    "CVE-2026-8829"
  ]
}



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