CVE-2026-63729

MEDIUMPre-NVD 6.66.6—
EchelonGraph scoreMEDIUM confidence

Score 6.6 from GitHub Security Advisory published 2026-07-21. the CNA's CVSS baseline 6.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
6.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.6
EG Score
6.6(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity66% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 28, 2026

Advisory Details (4)

Auto-updated Jul 21, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

TeX Live SyncTeX Parser Heap Use-After-Free via Malformed SyncTeX File | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tex-live-synctex-parser-heap-use-after-free-via-malformed-synctex-file
github_commit

commit 002dcd3eac30 (TeX-Live/texlive-source)

Fix landed in TeX-Live/texlive-source commit 002dcd3eac30 — awaiting tagged release

https://github.com/TeX-Live/texlive-source/commit/002dcd3eac30db5c352f53d4181737961cc7ee9a
generic

GitHub - TeX-Live/texlive-source: source part of the TeX Live subversion repository - for issues please contact the tex-k mailing list at tug.org · GitHub

https://github.com/TeX-Live/texlive-source/
generic

Use-After-Free in SyncTeX Parser | Fatih's Blog

https://fatihhcelik.github.io/posts/evince-synctex-heap-use-after-free/

Vendor Advisories for CVE-2026-63729(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(12 across 4 ecosystems)
Debian:11(3)
PackageVulnerable rangeFixed inDependents
okular4:20.12.3-2 ... 4:26.04.2-1 (40 versions)——
texlive-bin2020.20200327.54578-7 ... 2026.20260303.78225+ds-4 (38 versions)——
texstudio3.0.4+ds-1 ... 4.9.6+ds-1 (25 versions)——
Debian:12(3)
PackageVulnerable rangeFixed inDependents
okular4:22.12.3-1 ... 4:26.08.0-1 (22 versions)——
texlive-bin2022.20220321.62855-5.1 ... 2026.20260303.78225+ds-5 (32 versions)——
texstudio4.3.1+ds-2 ... 4.9.7+ds-1 (19 versions)——
Debian:13(3)
PackageVulnerable rangeFixed inDependents
okular4:25.04.2-1 ... 4:26.08.0-1 (8 versions)——
texlive-bin2024.20240313.70630+ds-6 ... 2026.20260303.78225+ds-5 (12 versions)——
texstudio4.8.7+ds-1 ... 4.9.7+ds-1 (8 versions)——
Debian:14(3)
PackageVulnerable rangeFixed inDependents
okular4:25.04.2-1 ... 4:26.08.0-1 (7 versions)——
texlive-bin2024.20240313.70630+ds-6 ... 2026.20260303.78225+ds-1 (8 versions)2026.20260303.78225+ds-2—
texstudio4.8.7+ds-1 ... 4.9.2+ds-1 (6 versions)4.9.6+ds-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 66× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:37 UTCEPSS rescore
  3. 2026-09-11 09:16 UTCEG score recompute
  4. 2026-09-11 09:16 UTCGHSA enrichment
  5. 2026-09-09 11:43 UTCEG score recompute
  6. 2026-09-09 11:43 UTCGHSA enrichment
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-07 22:45 UTCEG score recompute
  9. 2026-09-07 22:45 UTCGHSA enrichment
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-06 11:21 UTCGHSA enrichment
  13. 2026-09-05 09:16 UTCEG score recompute
  14. 2026-09-05 09:16 UTCGHSA enrichment
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-02 01:00 UTCEG score recompute
  17. 2026-09-02 01:00 UTCGHSA enrichment
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-09-01 04:40 UTCEPSS rescore
  20. 2026-08-31 03:44 UTCEG score recompute
  21. 2026-08-31 03:44 UTCGHSA enrichment
  22. 2026-08-30 19:17 UTCEPSS rescore
  23. 2026-08-30 02:27 UTCEG score recompute
  24. 2026-08-30 02:27 UTCGHSA enrichment
  25. 2026-08-30 01:22 UTCEPSS rescore
Show 75 more
  1. 2026-08-28 21:42 UTCEPSS rescore
  2. 2026-08-27 22:57 UTCEG score recompute
  3. 2026-08-27 22:57 UTCGHSA enrichment
  4. 2026-08-27 14:25 UTCEPSS rescore
  5. 2026-08-26 21:41 UTCEG score recompute
  6. 2026-08-26 21:41 UTCGHSA enrichment
  7. 2026-08-26 14:46 UTCEPSS rescore
  8. 2026-08-25 15:01 UTCEG score recompute
  9. 2026-08-25 15:01 UTCGHSA enrichment
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-24 13:44 UTCEG score recompute
  12. 2026-08-24 13:44 UTCGHSA enrichment
  13. 2026-08-23 12:28 UTCEG score recompute
  14. 2026-08-23 12:28 UTCGHSA enrichment
  15. 2026-08-23 00:19 UTCEPSS rescore
  16. 2026-08-22 11:12 UTCEG score recompute
  17. 2026-08-22 11:12 UTCGHSA enrichment
  18. 2026-08-21 23:49 UTCEPSS rescore
  19. 2026-08-21 09:56 UTCEG score recompute
  20. 2026-08-21 09:56 UTCGHSA enrichment
  21. 2026-08-20 22:55 UTCEPSS rescore
  22. 2026-08-20 08:39 UTCEG score recompute
  23. 2026-08-20 08:39 UTCGHSA enrichment
  24. 2026-08-19 17:04 UTCEPSS rescore
  25. 2026-08-19 07:23 UTCGHSA enrichment
  26. 2026-08-18 06:07 UTCEG score recompute
  27. 2026-08-18 06:07 UTCGHSA enrichment
  28. 2026-08-17 13:47 UTCEPSS rescore
  29. 2026-08-17 04:48 UTCEG score recompute
  30. 2026-08-17 04:48 UTCGHSA enrichment
  31. 2026-08-16 14:56 UTCEPSS rescore
  32. 2026-08-16 03:32 UTCEG score recompute
  33. 2026-08-16 03:32 UTCGHSA enrichment
  34. 2026-08-15 02:16 UTCEG score recompute
  35. 2026-08-15 02:16 UTCGHSA enrichment
  36. 2026-08-15 01:30 UTCEPSS rescore
  37. 2026-08-14 01:00 UTCEG score recompute
  38. 2026-08-14 01:00 UTCGHSA enrichment
  39. 2026-08-13 22:00 UTCEPSS rescore
  40. 2026-08-12 23:44 UTCEG score recompute
  41. 2026-08-12 23:44 UTCGHSA enrichment
  42. 2026-08-12 13:51 UTCEPSS rescore
  43. 2026-08-11 22:28 UTCEG score recompute
  44. 2026-08-11 22:28 UTCGHSA enrichment
  45. 2026-08-11 00:00 UTCEPSS rescore
  46. 2026-08-10 21:12 UTCGHSA enrichment
  47. 2026-08-09 19:56 UTCEG score recompute
  48. 2026-08-09 19:56 UTCGHSA enrichment
  49. 2026-08-09 13:47 UTCEPSS rescore
  50. 2026-08-08 18:40 UTCEG score recompute
  51. 2026-08-08 18:40 UTCGHSA enrichment
  52. 2026-08-08 16:37 UTCEPSS rescore
  53. 2026-08-07 17:23 UTCEG score recompute
  54. 2026-08-07 17:23 UTCGHSA enrichment
  55. 2026-08-06 16:07 UTCEG score recompute
  56. 2026-08-06 16:07 UTCGHSA enrichment
  57. 2026-08-06 13:47 UTCEPSS rescore
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-05 14:50 UTCEG score recompute
  61. 2026-08-05 14:50 UTCGHSA enrichment
  62. 2026-08-04 15:10 UTCEPSS rescore
  63. 2026-08-04 12:51 UTCEG score recompute
  64. 2026-08-04 12:51 UTCGHSA enrichment
  65. 2026-08-04 10:39 UTCEPSS rescore
  66. 2026-08-03 10:36 UTCEPSS rescore
  67. 2026-08-03 09:28 UTCGHSA enrichment
  68. 2026-08-02 07:56 UTCEG score recompute
  69. 2026-08-02 07:56 UTCGHSA enrichment
  70. 2026-08-02 02:27 UTCEPSS rescore
  71. 2026-08-01 06:39 UTCEG score recompute
  72. 2026-08-01 06:39 UTCGHSA enrichment
  73. 2026-08-01 04:16 UTCEPSS rescore
  74. 2026-07-31 05:20 UTCEG score recompute
  75. 2026-07-31 05:20 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-63729?
CVE-2026-63729 is a medium vulnerability published on 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.…
When was CVE-2026-63729 disclosed?
CVE-2026-63729 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63729 actively exploited?
CVE-2026-63729 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.8% of all scored CVEs.
What is the CVSS score of CVE-2026-63729?
CVE-2026-63729 has a CVSS v4.0 base score of 6.6 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-63729?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63729, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-63729

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