CVE-2026-6653

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Aug 22, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Use After Free in libxml2 [fixed in 2.11.0 without CVE] (#1058) · Issues · GNOME / libxml2 · GitLab

https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058
generic🟡 PoC Available

Bug #2141260 “libxml2 - CVE-2026-6653 - use after free in patch ...” : Bugs : libxml2 package : Ubuntu

https://bugs.launchpad.net/ubuntu/+source/libxml2/+bug/2141260

Vendor Advisories for CVE-2026-6653(1)

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
ubuntupython3-libxml2 (2.9.13+dfsg-1ubuntu0.12) @ jammy2026-08-25ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.3+dfsg-0exp1 ... 2.9.14+dfsg-1.3~deb12u6 (68 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.3+dfsg-0exp1 ... 2.9.14+dfsg-1.3~deb12u6 (48 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.7+dfsg+really2.9.14-2.1 ... 2.15.3+dfsg-1 (30 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libxml22.12.7+dfsg+really2.9.14-2.1 ... 2.14.5+dfsg-0exp2 (12 versions)2.14.5+dfsg-0.1—

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 52× in last 7d / 325× 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 508 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-6653?
CVE-2026-6653 is a critical vulnerability published on June 22, 2026. Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.
When was CVE-2026-6653 disclosed?
CVE-2026-6653 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6653 actively exploited?
CVE-2026-6653 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.9% of all scored CVEs.
What is the CVSS score of CVE-2026-6653?
CVE-2026-6653 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-6653?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6653, 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

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