PT-2026-61819 · Tex Live · Tex Live

Fatih Çelik · CVE-2026-63729 · Published 2026-07-21 · Updated 2026-07-21

NVD

CVSS v3.1

6.6

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

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.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-63729

Affected Products

Tex Live

References · 5

• https://github.com/TeX-Live/texlive-source/commit/002dcd3eac30db5c352f53d4181737961cc7ee9a · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-63729 · Security Note
• https://vulncheck.com/advisories/tex-live-synctex-parser-heap-use-after-free-via-malformed-synctex-file · Note
• https://fatihhcelik.github.io/posts/evince-synctex-heap-use-after-free · Note
• https://github.com/TeX-Live/texlive-source · Note