The SyncTeX parser (synctex_parser.c) shipped with TeX Live and embedded by downstream consumers...
Summary
Vulnerability reported (CVE-2026-63729). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-63729 has been found.
Risk of unauthorized operations or information disclosure. CVSS score: 6.6/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-63729" on the vendor's site.
CVE-2026-63729 — CWE-416 / CVSS v3 6.6
Attack vector: local / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Use-after-free (CWE-416) has been reported.
Check the vendor advisory for the affected versions.
Severity: Medium (CVSS 6.6/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-63729 okular
- Ubuntu UBUNTU-CVE-2026-63729 texlive-bin
References
- advisory vulncheck.com
- advisory nvd.nist.gov
- advisory github.com
- patch github.com
- web fatihhcelik.github.io
- web github.com
- web fatihhcelik.github.io
- web github.com
- web github.com