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: 0%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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Sep 12, 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(4)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-libxml2 (2.9.14+dfsg-1.3ubuntu3.8) @ noble2026-09-18ubuntu
redhatrhui5/rhua-rhel9:17888805812026-09-09redhat
redhatlibxml2-0:2.9.13-14.el9_8.42026-08-31redhat
redhatdiscovery/discovery-server-rhel9:17882057792026-08-31redhat

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.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 16× in last 7d / 89× 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 542 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 70.7% 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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