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CVE-2026-11979

CVE-2026-11979 · Stack-Based Buffer Overflow in libxml2

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

libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking. By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame. Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process. This issue has been fixed in the commit c2e233fc. NOTE: The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.

CVSS 1.8 · Low · EPSS 0.1% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • libxml2

    Versions
    • ≥ 0, ≤ 2.15.3: Affected (custom)

    No fix published

  • libxml2 Debian:12

    Versions
    • 2.12.3+dfsg-0exp1
    • 2.12.5+dfsg-0exp1
    • 2.12.6+dfsg-0exp1
    • 2.12.6+dfsg-0exp2
    • 2.12.7+dfsg+really2.9.14-0.1
    • 2.12.7+dfsg+really2.9.14-0.2
    • 2.12.7+dfsg+really2.9.14-0.3
    • 2.12.7+dfsg+really2.9.14-0.4
    • 2.12.7+dfsg+really2.9.14-1
    • 2.12.7+dfsg+really2.9.14-2
    • 2.12.7+dfsg+really2.9.14-2.1
    • 2.12.7+dfsg-1
    • 2.12.7+dfsg-2
    • 2.12.7+dfsg-3
    • 2.13.1+dfsg-0exp1
    • 2.13.3+dfsg-0exp1
    • 2.13.3+dfsg-0exp2
    • 2.14.1+dfsg-0exp1
    • 2.14.2+dfsg-0exp1
    • 2.14.3+dfsg-0exp1
    • 2.14.3+dfsg-0exp2
    • 2.14.3+dfsg-0exp3
    • 2.14.4+dfsg-0exp1
    • 2.14.5+dfsg-0.1
    • 2.14.5+dfsg-0.2
    • 2.14.5+dfsg-0exp1
    • 2.14.5+dfsg-0exp2
    • 2.14.6+dfsg-0.1
    • 2.15.0+dfsg-0.1
    • 2.15.0+dfsg-0.2
    • 2.15.0+dfsg-0.3
    • 2.15.1+dfsg-0.1
    • 2.15.1+dfsg-0.2
    • 2.15.1+dfsg-0.3
    • 2.15.1+dfsg-0.4
    • 2.15.1+dfsg-0.5
    • 2.15.1+dfsg-1
    • 2.15.1+dfsg-2
    • 2.15.2+dfsg-0.1
    • 2.15.3+dfsg-1
    • 2.15.4+dfsg-1
    • 2.9.14+dfsg-1.2
    • 2.9.14+dfsg-1.3
    • 2.9.14+dfsg-1.3~deb12u1
    • 2.9.14+dfsg-1.3~deb12u2
    • 2.9.14+dfsg-1.3~deb12u3
    • 2.9.14+dfsg-1.3~deb12u4
    • 2.9.14+dfsg-1.3~deb12u5
    • 2.9.14+dfsg-1.3~deb12u6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Debian:13

    Versions
    • 2.12.7+dfsg+really2.9.14-2.1
    • 2.12.7+dfsg+really2.9.14-2.1+deb13u1
    • 2.12.7+dfsg+really2.9.14-2.1+deb13u2
    • 2.12.7+dfsg+really2.9.14-2.1+deb13u3
    • 2.13.1+dfsg-0exp1
    • 2.13.3+dfsg-0exp1
    • 2.13.3+dfsg-0exp2
    • 2.14.1+dfsg-0exp1
    • 2.14.2+dfsg-0exp1
    • 2.14.3+dfsg-0exp1
    • 2.14.3+dfsg-0exp2
    • 2.14.3+dfsg-0exp3
    • 2.14.4+dfsg-0exp1
    • 2.14.5+dfsg-0.1
    • 2.14.5+dfsg-0.2
    • 2.14.5+dfsg-0exp1
    • 2.14.5+dfsg-0exp2
    • 2.14.6+dfsg-0.1
    • 2.15.0+dfsg-0.1
    • 2.15.0+dfsg-0.2
    • 2.15.0+dfsg-0.3
    • 2.15.1+dfsg-0.1
    • 2.15.1+dfsg-0.2
    • 2.15.1+dfsg-0.3
    • 2.15.1+dfsg-0.4
    • 2.15.1+dfsg-0.5
    • 2.15.1+dfsg-1
    • 2.15.1+dfsg-2
    • 2.15.2+dfsg-0.1
    • 2.15.3+dfsg-1
    • 2.15.4+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Debian:14

    Versions
    • 2.12.7+dfsg+really2.9.14-2.1
    • 2.13.1+dfsg-0exp1
    • 2.13.3+dfsg-0exp1
    • 2.13.3+dfsg-0exp2
    • 2.14.1+dfsg-0exp1
    • 2.14.2+dfsg-0exp1
    • 2.14.3+dfsg-0exp1
    • 2.14.3+dfsg-0exp2
    • 2.14.3+dfsg-0exp3
    • 2.14.4+dfsg-0exp1
    • 2.14.5+dfsg-0.1
    • 2.14.5+dfsg-0.2
    • 2.14.5+dfsg-0exp1
    • 2.14.5+dfsg-0exp2
    • 2.14.6+dfsg-0.1
    • 2.15.0+dfsg-0.1
    • 2.15.0+dfsg-0.2
    • 2.15.0+dfsg-0.3
    • 2.15.1+dfsg-0.1
    • 2.15.1+dfsg-0.2
    • 2.15.1+dfsg-0.3
    • 2.15.1+dfsg-0.4
    • 2.15.1+dfsg-0.5
    • 2.15.1+dfsg-1
    • 2.15.1+dfsg-2
    • 2.15.2+dfsg-0.1
    • 2.15.3+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 2.15.4+dfsg-1

    Update to 2.15.4+dfsg-1

  • libxml2 Ubuntu:Pro:14.04:LTS

    Versions
    • 2.9.1+dfsg1-3ubuntu2
    • 2.9.1+dfsg1-3ubuntu3
    • 2.9.1+dfsg1-3ubuntu4
    • 2.9.1+dfsg1-3ubuntu4.1
    • 2.9.1+dfsg1-3ubuntu4.2
    • 2.9.1+dfsg1-3ubuntu4.3
    • 2.9.1+dfsg1-3ubuntu4.4
    • 2.9.1+dfsg1-3ubuntu4.5
    • 2.9.1+dfsg1-3ubuntu4.6
    • 2.9.1+dfsg1-3ubuntu4.7
    • 2.9.1+dfsg1-3ubuntu4.8
    • 2.9.1+dfsg1-3ubuntu4.9
    • 2.9.1+dfsg1-3ubuntu4.10
    • 2.9.1+dfsg1-3ubuntu4.11
    • 2.9.1+dfsg1-3ubuntu4.12
    • 2.9.1+dfsg1-3ubuntu4.13
    • 2.9.1+dfsg1-3ubuntu4.13+esm1
    • 2.9.1+dfsg1-3ubuntu4.13+esm2
    • 2.9.1+dfsg1-3ubuntu4.13+esm3
    • 2.9.1+dfsg1-3ubuntu4.13+esm4
    • 2.9.1+dfsg1-3ubuntu4.13+esm5
    • 2.9.1+dfsg1-3ubuntu4.13+esm6
    • 2.9.1+dfsg1-3ubuntu4.13+esm7
    • 2.9.1+dfsg1-3ubuntu4.13+esm8
    • 2.9.1+dfsg1-3ubuntu4.13+esm9
    • 2.9.1+dfsg1-3ubuntu4.13+esm10
    • 2.9.1+dfsg1-3ubuntu4.13+esm11
    • 2.9.1+dfsg1-3ubuntu4.13+esm12
    • 2.9.1+dfsg1-3ubuntu4.13+esm13
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:Pro:16.04:LTS

    Versions
    • 2.9.2+zdfsg1-4
    • 2.9.2+zdfsg1-4ubuntu1
    • 2.9.2+zdfsg1-4ubuntu2
    • 2.9.2+zdfsg1-4ubuntu3
    • 2.9.3+dfsg1-1
    • 2.9.3+dfsg1-1ubuntu0.1
    • 2.9.3+dfsg1-1ubuntu0.2
    • 2.9.3+dfsg1-1ubuntu0.3
    • 2.9.3+dfsg1-1ubuntu0.4
    • 2.9.3+dfsg1-1ubuntu0.5
    • 2.9.3+dfsg1-1ubuntu0.6
    • 2.9.3+dfsg1-1ubuntu0.7
    • 2.9.3+dfsg1-1ubuntu0.7+esm1
    • 2.9.3+dfsg1-1ubuntu0.7+esm2
    • 2.9.3+dfsg1-1ubuntu0.7+esm3
    • 2.9.3+dfsg1-1ubuntu0.7+esm4
    • 2.9.3+dfsg1-1ubuntu0.7+esm5
    • 2.9.3+dfsg1-1ubuntu0.7+esm6
    • 2.9.3+dfsg1-1ubuntu0.7+esm7
    • 2.9.3+dfsg1-1ubuntu0.7+esm8
    • 2.9.3+dfsg1-1ubuntu0.7+esm9
    • 2.9.3+dfsg1-1ubuntu0.7+esm10
    • 2.9.3+dfsg1-1ubuntu0.7+esm11
    • 2.9.3+dfsg1-1ubuntu0.7+esm12
    • 2.9.3+dfsg1-1ubuntu0.7+esm13
    • 2.9.3+dfsg1-1ubuntu0.7+esm14
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:Pro:18.04:LTS

    Versions
    • 2.9.4+dfsg1-4ubuntu1
    • 2.9.4+dfsg1-5ubuntu1
    • 2.9.4+dfsg1-5ubuntu2
    • 2.9.4+dfsg1-5.1ubuntu1
    • 2.9.4+dfsg1-5.2ubuntu1
    • 2.9.4+dfsg1-6.1ubuntu1
    • 2.9.4+dfsg1-6.1ubuntu1.2
    • 2.9.4+dfsg1-6.1ubuntu1.3
    • 2.9.4+dfsg1-6.1ubuntu1.4
    • 2.9.4+dfsg1-6.1ubuntu1.5
    • 2.9.4+dfsg1-6.1ubuntu1.6
    • 2.9.4+dfsg1-6.1ubuntu1.7
    • 2.9.4+dfsg1-6.1ubuntu1.8
    • 2.9.4+dfsg1-6.1ubuntu1.9
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm1
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm2
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm3
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm4
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm5
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm6
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm7
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm8
    • 2.9.4+dfsg1-6.1ubuntu1.9+esm9
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:Pro:20.04:LTS

    Versions
    • 2.9.4+dfsg1-7ubuntu3
    • 2.9.4+dfsg1-7ubuntu5
    • 2.9.4+dfsg1-8ubuntu1
    • 2.9.4+dfsg1-8ubuntu2
    • 2.9.4+dfsg1-8ubuntu3
    • 2.9.10+dfsg-1ubuntu3
    • 2.9.10+dfsg-4build1
    • 2.9.10+dfsg-5
    • 2.9.10+dfsg-5ubuntu0.20.04.1
    • 2.9.10+dfsg-5ubuntu0.20.04.2
    • 2.9.10+dfsg-5ubuntu0.20.04.3
    • 2.9.10+dfsg-5ubuntu0.20.04.4
    • 2.9.10+dfsg-5ubuntu0.20.04.5
    • 2.9.10+dfsg-5ubuntu0.20.04.6
    • 2.9.10+dfsg-5ubuntu0.20.04.7
    • 2.9.10+dfsg-5ubuntu0.20.04.8
    • 2.9.10+dfsg-5ubuntu0.20.04.9
    • 2.9.10+dfsg-5ubuntu0.20.04.10
    • 2.9.10+dfsg-5ubuntu0.20.04.10+esm1
    • 2.9.10+dfsg-5ubuntu0.20.04.10+esm2
    • 2.9.10+dfsg-5ubuntu0.20.04.10+esm3
    • 2.9.10+dfsg-5ubuntu0.20.04.10+esm4
    • 2.9.10+dfsg-5ubuntu0.20.04.10+esm5
    • 2.9.10+dfsg-5ubuntu0.20.04.10+esm6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:22.04:LTS

    Versions
    • 2.9.12+dfsg-4
    • 2.9.12+dfsg-5
    • 2.9.12+dfsg-6
    • 2.9.13+dfsg-1
    • 2.9.13+dfsg-1build1
    • 2.9.13+dfsg-1ubuntu0.1
    • 2.9.13+dfsg-1ubuntu0.2
    • 2.9.13+dfsg-1ubuntu0.3
    • 2.9.13+dfsg-1ubuntu0.4
    • 2.9.13+dfsg-1ubuntu0.5
    • 2.9.13+dfsg-1ubuntu0.6
    • 2.9.13+dfsg-1ubuntu0.7
    • 2.9.13+dfsg-1ubuntu0.8
    • 2.9.13+dfsg-1ubuntu0.9
    • 2.9.13+dfsg-1ubuntu0.10
    • 2.9.13+dfsg-1ubuntu0.11
    • 2.9.13+dfsg-1ubuntu0.12
    • 2.9.13+dfsg-1ubuntu0.13
    • 2.9.13+dfsg-1ubuntu0.14
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:24.04:LTS

    Versions
    • 2.9.14+dfsg-1.3
    • 2.9.14+dfsg-1.3build1
    • 2.9.14+dfsg-1.3build2
    • 2.9.14+dfsg-1.3build3
    • 2.9.14+dfsg-1.3ubuntu1
    • 2.9.14+dfsg-1.3ubuntu2
    • 2.9.14+dfsg-1.3ubuntu3
    • 2.9.14+dfsg-1.3ubuntu3.1
    • 2.9.14+dfsg-1.3ubuntu3.2
    • 2.9.14+dfsg-1.3ubuntu3.3
    • 2.9.14+dfsg-1.3ubuntu3.4
    • 2.9.14+dfsg-1.3ubuntu3.5
    • 2.9.14+dfsg-1.3ubuntu3.6
    • 2.9.14+dfsg-1.3ubuntu3.7
    • 2.9.14+dfsg-1.3ubuntu3.8
    • 2.9.14+dfsg-1.3ubuntu3.9
    • 2.9.14+dfsg-1.3ubuntu3.10
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:25.10

    Versions
    • 2.12.7+dfsg+really2.9.14-0.4
    • 2.12.7+dfsg+really2.9.14-0.4ubuntu0.1
    • 2.12.7+dfsg+really2.9.14-1
    • 2.14.3+dfsg-0exp1
    • 2.14.3+dfsg-0exp2
    • 2.14.3+dfsg-0exp3
    • 2.14.4+dfsg-0exp1
    • 2.14.5+dfsg-0exp1
    • 2.14.5+dfsg-0exp2
    • 2.14.5+dfsg-0.1
    • 2.14.5+dfsg-0.2
    • 2.14.5+dfsg-0.2ubuntu0.1
    • 2.14.5+dfsg-0.2ubuntu0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • libxml2 Ubuntu:26.04:LTS

    Versions
    • 2.14.5+dfsg-0.2
    • 2.14.5+dfsg-0.2build1
    • 2.15.1+dfsg-0.3
    • 2.15.1+dfsg-0.4
    • 2.15.1+dfsg-1
    • 2.15.1+dfsg-2
    • 2.15.1+dfsg-2ubuntu1
    • 2.15.1+dfsg-2ubuntu2
    • 2.15.2+dfsg-0.1
    • 2.15.2+dfsg-0.1ubuntu0.1
    • 2.15.2+dfsg-0.1ubuntu0.2
    • 2.15.2+dfsg-0.1ubuntu0.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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