VDB
CVE-2026-63729
CVE-2026-63729
PUBLISHED
CVSS 6.8 MEDIUM
Reported by VulnCheck · Published July 21, 2026
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.
Risk Scores
CVSS 4.0
6.8
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| TeX Live | TeX Live | 0, TeX Live 2026 |
| TeX Live | TeX Live | 0, TeX Live 2026, 0 |
| tug | tex_live |
Timeline
- Jul 21, 2026 EPSS Score
- Jul 21, 2026 CVE Published
- Jul 23, 2026 CVE Updated
- Aug 7, 2026 EPSS Score
References
- Product product
- Patch Commit patch
- Blog Post
- third-party-advisory