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DEBIAN-CVE-2026-34743

Type: advisorySource: OSV1 source record

XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-34743

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:DEBIAN-CVE-2026-34743

xz-utils

Source reference: /affected/0/package/name

Affected versions
5.4.1-0.2

Source reference: /affected/0/versions

5.4.1-1

Source reference: /affected/0/versions

Fixed versions
5.4.1-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

xz-utils

Source reference: /affected/1/package/name

Affected versions
5.8.1-1

Source reference: /affected/1/versions

Fixed versions
5.8.1-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

xz-utils

Source reference: /affected/2/package/name

Affected versions
5.8.1-1

Source reference: /affected/2/versions

5.8.1-1.1

Source reference: /affected/2/versions

5.8.1-2

Source reference: /affected/2/versions

5.8.2-1

Source reference: /affected/2/versions

5.8.2-2

Source reference: /affected/2/versions

Fixed versions
5.8.3-1

Source reference: /affected/2/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": "5.4.1-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "xz-utils",
      "purl": "pkg:deb/debian/xz-utils?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "5.4.1-0.2",
      "5.4.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34743.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "5.8.1-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "xz-utils",
      "purl": "pkg:deb/debian/xz-utils?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "5.8.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34743.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "5.8.3-1"
          }
        ]
      }
    ],
    "package": {
      "name": "xz-utils",
      "purl": "pkg:deb/debian/xz-utils?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "5.8.1-1",
      "5.8.1-1.1",
      "5.8.1-2",
      "5.8.2-1",
      "5.8.2-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34743.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56429 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-34743 · Revision 1Source updated