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ALPINE-CVE-2026-76957

Type: advisorySource: OSV1 source record

libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

Announced Source revision 1
Original source ↗

ALPINE-CVE-2026-76957

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:ALPINE-CVE-2026-76957

expat

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
2.8.4-r0

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

expat

Source reference: /affected/1/package/name

Affected versions
Not stated in this record
Fixed versions
2.8.4-r0

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

expat

Source reference: /affected/2/package/name

Affected versions
Not stated in this record
Fixed versions
2.8.4-r0

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

expat

Source reference: /affected/3/package/name

Affected versions
Not stated in this record
Fixed versions
2.8.4-r0

Source reference: /affected/3/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.4-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "expat",
      "purl": "pkg:apk/alpine/expat?arch=source",
      "ecosystem": "Alpine:v3.21"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-76957.json"
    },
    "ecosystem_specific": {}
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.4-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "expat",
      "purl": "pkg:apk/alpine/expat?arch=source",
      "ecosystem": "Alpine:v3.22"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-76957.json"
    },
    "ecosystem_specific": {}
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.4-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "expat",
      "purl": "pkg:apk/alpine/expat?arch=source",
      "ecosystem": "Alpine:v3.23"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-76957.json"
    },
    "ecosystem_specific": {}
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.4-r0"
          }
        ]
      }
    ],
    "package": {
      "name": "expat",
      "purl": "pkg:apk/alpine/expat?arch=source",
      "ecosystem": "Alpine:v3.24"
    },
    "database_specific": {
      "source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-76957.json"
    },
    "ecosystem_specific": {}
  }
]

Publisher severity

No explicit severity was provided.

Event
#55169 · Revision 1
Added to Heist Feed
Publisher date
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