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CVE-2026-34743

CVE-2026-34743 · XZ Utils: Buffer overflow in lzma_index_append()

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 1.7 · Low · EPSS 0.5% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • xz

    Versions
    • < 5.8.3: Affected

    No fix published

  • xz-utils Debian:12

    Versions
    • 5.4.1-0.2
    • 5.4.1-1
    Affected ranges
    • ECOSYSTEM: < 5.4.1-1+deb12u1

    Update to 5.4.1-1+deb12u1

  • xz-utils Debian:13

    Versions
    • 5.8.1-1
    Affected ranges
    • ECOSYSTEM: < 5.8.1-1+deb13u1

    Update to 5.8.1-1+deb13u1

  • xz-utils Debian:14

    Versions
    • 5.8.1-1
    • 5.8.1-1.1
    • 5.8.1-2
    • 5.8.2-1
    • 5.8.2-2
    Affected ranges
    • ECOSYSTEM: < 5.8.3-1

    Update to 5.8.3-1

  • xz-utils Ubuntu:Pro:14.04:LTS

    Versions
    • 5.1.1alpha+20120614-2ubuntu1
    • 5.1.1alpha+20120614-2ubuntu2
    • 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm1
    Affected ranges
    • ECOSYSTEM: < 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2

    Update to 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2

  • xz-utils Ubuntu:Pro:16.04:LTS

    Versions
    • 5.1.1alpha+20120614-2ubuntu2
    • 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm1
    Affected ranges
    • ECOSYSTEM: < 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2

    Update to 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2

  • xz-utils Ubuntu:Pro:18.04:LTS

    Versions
    • 5.2.2-1.3
    • 5.2.2-1.3ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 5.2.2-1.3ubuntu0.1+esm1

    Update to 5.2.2-1.3ubuntu0.1+esm1

  • xz-utils Ubuntu:Pro:20.04:LTS

    Versions
    • 5.2.4-1
    • 5.2.4-1ubuntu1
    • 5.2.4-1ubuntu1.1
    Affected ranges
    • ECOSYSTEM: < 5.2.4-1ubuntu1.1+esm1

    Update to 5.2.4-1ubuntu1.1+esm1

  • xz-utils Ubuntu:22.04:LTS

    Versions
    • 5.2.5-2
    • 5.2.5-2build1
    • 5.2.5-2build2
    • 5.2.5-2ubuntu1
    Affected ranges
    • ECOSYSTEM: < 5.2.5-2ubuntu1.1

    Update to 5.2.5-2ubuntu1.1

  • xz-utils Ubuntu:24.04:LTS

    Versions
    • 5.4.1-0.2
    • 5.4.4-0.1
    • 5.4.5-0.1
    • 5.4.5-0.3
    • 5.6.0-0.2
    • 5.6.1+really5.4.5-1
    • 5.6.1+really5.4.5-1build0.1
    • 5.6.1+really5.4.5-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 5.6.1+really5.4.5-1ubuntu0.3

    Update to 5.6.1+really5.4.5-1ubuntu0.3

  • xz-utils Ubuntu:25.10

    Versions
    • 5.6.4-1ubuntu1
    • 5.8.1-1
    • 5.8.1-1build1
    • 5.8.1-1build2
    Affected ranges
    • ECOSYSTEM: < 5.8.1-1ubuntu0.1

    Update to 5.8.1-1ubuntu0.1

Original sources

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