CVE-2026-86140

HIGHNVD 7.88.0▲
EchelonGraph scoreHIGH confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-05. NVD baseline CVSS 7.8; sources differ by 0.2.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

CVSS v3
7.8
EG Score
8.0(high)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity80% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 15, 2026

Advisory Details (2)

Auto-updated Sep 5, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit d1686f91dbda (GNOME/libxml2)

Fix landed in GNOME/libxml2 commit d1686f91dbda — awaiting tagged release

https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340
generic

Comparing v2.15.3...v2.15.4 · GNOME/libxml2 · GitHub

https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4

Vendor Advisories for CVE-2026-86140(3)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibxml2-main-2.15.4-0.1.hum12026-09-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.3+dfsg-0exp1 ... 2.9.14+dfsg-1.3~deb12u6 (49 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.7+dfsg+really2.9.14-2.1 ... 2.15.4+dfsg-1 (31 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.7+dfsg+really2.9.14-2.1 ... 2.15.4+dfsg-1 (28 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 43× in last 7d / 81× 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.

  1. 2026-09-19 01:04 UTCEG score recompute
  2. 2026-09-19 01:04 UTCVendor advisory
  3. 2026-09-19 01:04 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 12:30 UTCVendor advisory
  6. 2026-09-18 12:30 UTCGHSA enrichment
  7. 2026-09-17 23:56 UTCEG score recompute
  8. 2026-09-17 23:56 UTCVendor advisory
  9. 2026-09-17 23:56 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 10:08 UTCVendor advisory
  12. 2026-09-17 10:08 UTCGHSA enrichment
  13. 2026-09-16 21:34 UTCEG score recompute
  14. 2026-09-16 21:34 UTCVendor advisory
  15. 2026-09-16 21:34 UTCGHSA enrichment
  16. 2026-09-16 14:09 UTCEPSS rescore
  17. 2026-09-16 09:00 UTCEG score recompute
  18. 2026-09-16 09:00 UTCVendor advisory
  19. 2026-09-16 09:00 UTCGHSA enrichment
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-15 19:52 UTCEG score recompute
  22. 2026-09-15 19:52 UTCVendor advisory
  23. 2026-09-15 19:52 UTCGHSA enrichment
  24. 2026-09-15 19:52 UTCNVD updateCVSS v3 → 7.8
  25. 2026-09-15 17:34 UTCVendor advisory
Show 56 more
  1. 2026-09-15 17:34 UTCGHSA enrichment
  2. 2026-09-15 05:01 UTCEG score recompute
  3. 2026-09-15 05:01 UTCVendor advisory
  4. 2026-09-15 05:01 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 16:22 UTCVendor advisory
  8. 2026-09-14 16:22 UTCGHSA enrichment
  9. 2026-09-14 03:49 UTCEG score recompute
  10. 2026-09-14 03:49 UTCVendor advisory
  11. 2026-09-14 03:49 UTCGHSA enrichment
  12. 2026-09-13 15:16 UTCVendor advisory
  13. 2026-09-13 15:16 UTCGHSA enrichment
  14. 2026-09-13 02:41 UTCEG score recompute
  15. 2026-09-13 02:41 UTCVendor advisory
  16. 2026-09-13 02:41 UTCGHSA enrichment
  17. 2026-09-12 14:08 UTCVendor advisory
  18. 2026-09-12 14:08 UTCGHSA enrichment
  19. 2026-09-12 01:34 UTCEG score recompute
  20. 2026-09-12 01:34 UTCVendor advisory
  21. 2026-09-12 01:33 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 13:00 UTCEG score recompute
  25. 2026-09-11 13:00 UTCVendor advisory
  26. 2026-09-11 13:00 UTCGHSA enrichment
  27. 2026-09-11 00:27 UTCVendor advisory
  28. 2026-09-11 00:27 UTCGHSA enrichment
  29. 2026-09-10 11:54 UTCEG score recompute
  30. 2026-09-10 11:54 UTCVendor advisory
  31. 2026-09-10 11:54 UTCGHSA enrichment
  32. 2026-09-09 23:21 UTCVendor advisory
  33. 2026-09-09 23:21 UTCGHSA enrichment
  34. 2026-09-09 10:31 UTCEG score recompute
  35. 2026-09-09 10:31 UTCVendor advisory
  36. 2026-09-09 10:31 UTCGHSA enrichment
  37. 2026-09-08 22:01 UTCEPSS rescore
  38. 2026-09-08 21:54 UTCVendor advisory
  39. 2026-09-08 21:53 UTCGHSA enrichment
  40. 2026-09-08 19:56 UTCEG score recompute
  41. 2026-09-08 19:56 UTCGHSA enrichment
  42. 2026-09-08 09:58 UTCVendor advisory
  43. 2026-09-08 09:58 UTCGHSA enrichment
  44. 2026-09-07 20:18 UTCEG score recompute
  45. 2026-09-07 20:18 UTCGHSA enrichment
  46. 2026-09-07 07:45 UTCGHSA enrichment
  47. 2026-09-06 19:07 UTCEG score recompute
  48. 2026-09-06 19:06 UTCGHSA enrichment
  49. 2026-09-06 13:48 UTCEPSS rescore
  50. 2026-09-06 06:29 UTCGHSA enrichment
  51. 2026-09-05 17:56 UTCEG score recompute
  52. 2026-09-05 17:56 UTCGHSA enrichment
  53. 2026-09-05 15:31 UTCEPSS rescore
  54. 2026-09-05 05:23 UTCEG score recompute
  55. 2026-09-05 04:39 UTCEG score recompute
  56. 2026-09-05 04:38 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-86140?
CVE-2026-86140 is a high vulnerability published on September 5, 2026. In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.
When was CVE-2026-86140 disclosed?
CVE-2026-86140 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86140 actively exploited?
CVE-2026-86140 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 95.5% of all scored CVEs.
What is the CVSS score of CVE-2026-86140?
CVE-2026-86140 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.0.
How do I remediate CVE-2026-86140?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86140, 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-2026-86140

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