CVE-2026-86139

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
7.8EG
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, xmlURIEscapeStr in uri.c has an integer overflow.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
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 8edbbdb09f24 (GNOME/libxml2)

Fix landed in GNOME/libxml2 commit 8edbbdb09f24 — awaiting tagged release

https://github.com/GNOME/libxml2/commit/8edbbdb09f24d26a2f900141fddc2b9d014f53b0
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-2026-86139(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 36× 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.

  1. 2026-09-19 01:13 UTCEG score recompute
  2. 2026-09-19 01:13 UTCVendor advisory
  3. 2026-09-19 01:13 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 14:17 UTCVendor advisory
  6. 2026-09-18 14:17 UTCGHSA enrichment
  7. 2026-09-18 03:07 UTCEG score recompute
  8. 2026-09-18 03:07 UTCVendor advisory
  9. 2026-09-18 03:07 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 16:12 UTCVendor advisory
  12. 2026-09-17 16:12 UTCGHSA enrichment
  13. 2026-09-17 05:17 UTCVendor advisory
  14. 2026-09-17 05:17 UTCGHSA enrichment
  15. 2026-09-16 18:22 UTCEG score recompute
  16. 2026-09-16 18:22 UTCVendor advisory
  17. 2026-09-16 18:22 UTCGHSA enrichment
  18. 2026-09-16 14:09 UTCEPSS rescore
  19. 2026-09-16 06:48 UTCVendor advisory
  20. 2026-09-16 06:48 UTCGHSA enrichment
  21. 2026-09-15 19:52 UTCEG score recompute▲ 0.90
  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 · severity → HIGH
  25. 2026-09-15 19:14 UTCEG score recompute
Show 41 more
  1. 2026-09-15 19:14 UTCVendor advisory
  2. 2026-09-15 19:14 UTCGHSA enrichment
  3. 2026-09-15 03:12 UTCEPSS rescore
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 19:55 UTCVendor advisory
  6. 2026-09-14 19:55 UTCGHSA enrichment
  7. 2026-09-13 20:36 UTCEG score recompute
  8. 2026-09-13 20:36 UTCVendor advisory
  9. 2026-09-13 20:36 UTCGHSA enrichment
  10. 2026-09-12 21:18 UTCVendor advisory
  11. 2026-09-12 21:18 UTCGHSA enrichment
  12. 2026-09-11 21:59 UTCEG score recompute
  13. 2026-09-11 21:59 UTCVendor advisory
  14. 2026-09-11 21:59 UTCGHSA enrichment
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-10 22:40 UTCEG score recompute
  18. 2026-09-10 22:40 UTCVendor advisory
  19. 2026-09-10 22:40 UTCGHSA enrichment
  20. 2026-09-09 23:21 UTCEG score recompute
  21. 2026-09-09 23:21 UTCVendor advisory
  22. 2026-09-09 23:21 UTCGHSA enrichment
  23. 2026-09-08 22:01 UTCEPSS rescore
  24. 2026-09-08 21:54 UTCVendor advisory
  25. 2026-09-08 21:53 UTCGHSA enrichment
  26. 2026-09-08 15:13 UTCEG score recompute
  27. 2026-09-08 15:13 UTCVendor advisory
  28. 2026-09-08 15:13 UTCGHSA enrichment
  29. 2026-09-08 14:16 UTCEG score recompute
  30. 2026-09-08 14:16 UTCVendor advisory
  31. 2026-09-08 14:16 UTCGHSA enrichment
  32. 2026-09-08 03:18 UTCGHSA enrichment
  33. 2026-09-07 03:59 UTCEG score recompute
  34. 2026-09-07 03:59 UTCGHSA enrichment
  35. 2026-09-06 13:48 UTCEPSS rescore
  36. 2026-09-06 04:41 UTCEG score recompute
  37. 2026-09-06 04:41 UTCGHSA enrichment
  38. 2026-09-05 15:31 UTCEPSS rescore
  39. 2026-09-05 05:23 UTCEG score recompute
  40. 2026-09-05 04:39 UTCEG score recompute
  41. 2026-09-05 04:38 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-86139?
CVE-2026-86139 is a high vulnerability published on September 5, 2026. In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
When was CVE-2026-86139 disclosed?
CVE-2026-86139 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-2026-86139 actively exploited?
CVE-2026-86139 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 98.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86139?
CVE-2026-86139 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-86139?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86139, 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-2026-86139

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