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CVE-2026-63729

CVE-2026-63729 · TeX Live SyncTeX Parser Heap Use-After-Free via Malformed SyncTeX File

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

The SyncTeX parser (synctex_parser.c) shipped with TeX Live and embedded by downstream consumers such as GNOME Evince contains a heap use-after-free vulnerability that allows attackers to crash applications or potentially execute arbitrary code by supplying a malformed .synctex or .synctex.gz file. A malformed SyncTeX file can construct a ref node with a NULL parent pointer, causing the replacement routine to fail to detach the node from its sibling chain, which triggers recursive freeing of live tree nodes and leaves dangling pointers that are later accessed by the parser during document load.

CVSS 6.8 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • tex live

    Versions
    • ≥ 0, ≤ TeX Live 2025: Affected (custom)
    • TeX Live 2026: Not affected (custom)

    No fix published

  • okular Debian:12

    Versions
    • 4:22.12.3-1
    • 4:22.12.3-1+deb12u1
    • 4:23.08.1-1
    • 4:23.08.1-2
    • 4:24.05.2-1
    • 4:24.05.2-2
    • 4:24.05.2-3
    • 4:24.05.2-4
    • 4:24.08.2-1
    • 4:24.08.2-2
    • 4:24.12.0-1
    • 4:24.12.0-2
    • 4:24.12.2-1
    • 4:25.03.90-1
    • 4:25.04.0-1
    • 4:25.04.2-1
    • 4:25.04.2-2
    • 4:25.08.3-1
    • 4:25.11.90-1
    • 4:26.04.0-1
    • 4:26.04.2-1
    • 4:26.08.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • okular Debian:13

    Versions
    • 4:25.04.2-1
    • 4:25.04.2-1+deb13u1
    • 4:25.04.2-2
    • 4:25.08.3-1
    • 4:25.11.90-1
    • 4:26.04.0-1
    • 4:26.04.2-1
    • 4:26.08.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • okular Debian:14

    Versions
    • 4:25.04.2-1
    • 4:25.04.2-2
    • 4:25.08.3-1
    • 4:25.11.90-1
    • 4:26.04.0-1
    • 4:26.04.2-1
    • 4:26.08.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Debian:12

    Versions
    • 2022.20220321.62855-5.1
    • 2022.20220321.62855-5.1+deb12u1
    • 2022.20220321.62855-5.1+deb12u2
    • 2022.20220321.62855-6
    • 2022.20220321.62855-7
    • 2022.20220321.62855-8
    • 2023.20230311.66589-1
    • 2023.20230311.66589-2
    • 2023.20230311.66589-3
    • 2023.20230311.66589-4
    • 2023.20230311.66589-5
    • 2023.20230311.66589-6
    • 2023.20230311.66589-7
    • 2023.20230311.66589-8
    • 2023.20230311.66589-9
    • 2024.20240313.70630+ds-1
    • 2024.20240313.70630+ds-2
    • 2024.20240313.70630+ds-3
    • 2024.20240313.70630+ds-4
    • 2024.20240313.70630+ds-5
    • 2024.20240313.70630+ds-6
    • 2025.20250727.75242+ds-1
    • 2025.20250727.75242+ds-2
    • 2025.20250727.75242+ds-3
    • 2025.20250727.75242+ds-4
    • 2025.20250727.75242+ds-5
    • 2025.20250727.75242+ds-5~hurd.1
    • 2026.20260303.78225+ds-1
    • 2026.20260303.78225+ds-2
    • 2026.20260303.78225+ds-3
    • 2026.20260303.78225+ds-4
    • 2026.20260303.78225+ds-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Debian:13

    Versions
    • 2024.20240313.70630+ds-6
    • 2025.20250727.75242+ds-1
    • 2025.20250727.75242+ds-2
    • 2025.20250727.75242+ds-3
    • 2025.20250727.75242+ds-4
    • 2025.20250727.75242+ds-5
    • 2025.20250727.75242+ds-5~hurd.1
    • 2026.20260303.78225+ds-1
    • 2026.20260303.78225+ds-2
    • 2026.20260303.78225+ds-3
    • 2026.20260303.78225+ds-4
    • 2026.20260303.78225+ds-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Debian:14

    Versions
    • 2024.20240313.70630+ds-6
    • 2025.20250727.75242+ds-1
    • 2025.20250727.75242+ds-2
    • 2025.20250727.75242+ds-3
    • 2025.20250727.75242+ds-4
    • 2025.20250727.75242+ds-5
    • 2025.20250727.75242+ds-5~hurd.1
    • 2026.20260303.78225+ds-1
    Affected ranges
    • ECOSYSTEM: < 2026.20260303.78225+ds-2

    Update to 2026.20260303.78225+ds-2

  • texstudio Debian:12

    Versions
    • 4.3.1+ds-2
    • 4.3.1+ds-3
    • 4.7.2+ds-1
    • 4.7.2+ds-2
    • 4.8.0+ds-1
    • 4.8.1+ds-1
    • 4.8.2+ds-1
    • 4.8.4+ds-1
    • 4.8.4+ds-2
    • 4.8.5+ds-1
    • 4.8.6+ds-1
    • 4.8.7+ds-1
    • 4.8.8+ds-1
    • 4.8.9+ds-1
    • 4.9.0+ds-1
    • 4.9.1+ds-1
    • 4.9.2+ds-1
    • 4.9.6+ds-1
    • 4.9.7+ds-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texstudio Debian:13

    Versions
    • 4.8.7+ds-1
    • 4.8.8+ds-1
    • 4.8.9+ds-1
    • 4.9.0+ds-1
    • 4.9.1+ds-1
    • 4.9.2+ds-1
    • 4.9.6+ds-1
    • 4.9.7+ds-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texstudio Debian:14

    Versions
    • 4.8.7+ds-1
    • 4.8.8+ds-1
    • 4.8.9+ds-1
    • 4.9.0+ds-1
    • 4.9.1+ds-1
    • 4.9.2+ds-1
    Affected ranges
    • ECOSYSTEM: < 4.9.6+ds-1

    Update to 4.9.6+ds-1

  • texlive-bin Ubuntu:Pro:16.04:LTS

    Versions
    • 2015.20150524.37493-5build1
    • 2015.20150524.37493-7
    • 2015.20150524.37493-7build1
    • 2015.20150524.37493-7build4
    • 2015.20160222.37495-1
    • 2015.20160222.37495-1ubuntu0.1
    • 2015.20160222.37495-1ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Ubuntu:Pro:18.04:LTS

    Versions
    • 2017.20170613.44572-5build1
    • 2017.20170613.44572-5build2
    • 2017.20170613.44572-6
    • 2017.20170613.44572-6build1
    • 2017.20170613.44572-6ubuntu1
    • 2017.20170613.44572-8build1
    • 2017.20170613.44572-8ubuntu0.1
    • 2017.20170613.44572-8ubuntu0.2
    • 2017.20170613.44572-8ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Ubuntu:Pro:20.04:LTS

    Versions
    • 2019.20190605.51237-2build1
    • 2019.20190605.51237-3
    • 2019.20190605.51237-3build1
    • 2019.20190605.51237-3build2
    • 2019.20190605.51237-3ubuntu0.1
    • 2019.20190605.51237-3ubuntu0.2
    • 2019.20190605.51237-3ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Ubuntu:22.04:LTS

    Versions
    • 2020.20200327.54578-7
    • 2020.20200327.54578-7build1
    • 2021.20210626.59705-1
    • 2021.20210626.59705-1build1
    • 2021.20210626.59705-1ubuntu0.1
    • 2021.20210626.59705-1ubuntu0.2
    • 2021.20210626.59705-1ubuntu0.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Ubuntu:24.04:LTS

    Versions
    • 2023.20230311.66589-6
    • 2023.20230311.66589-7
    • 2023.20230311.66589-8
    • 2023.20230311.66589-8build1
    • 2023.20230311.66589-9
    • 2023.20230311.66589-9build2
    • 2023.20230311.66589-9build3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • texlive-bin Ubuntu:26.04:LTS

    Versions
    • 2024.20240313.70630+ds-6ubuntu2
    • 2025.20250727.75242+ds-4ubuntu2
    • 2025.20250727.75242+ds-5
    • 2025.20250727.75242+ds-5build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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