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
28%
KEV
Not listed

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Jul 25, 2026
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 (2.9.14+dfsg-1.3ubuntu3.8) @ noble2026-07-28ubuntu

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.

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 37× in last 7d / 157× 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 186 total refreshes for this CVE.

  1. 2026-07-28 15:37 UTCEPSS rescore
  2. 2026-07-28 15:25 UTCVendor advisory
  3. 2026-07-28 15:25 UTCGHSA enrichment
  4. 2026-07-28 10:07 UTCVendor advisory
  5. 2026-07-28 10:07 UTCGHSA enrichment
  6. 2026-07-28 05:57 UTCVendor advisory
  7. 2026-07-28 05:57 UTCGHSA enrichment
  8. 2026-07-28 02:00 UTCVendor advisory
  9. 2026-07-28 02:00 UTCGHSA enrichment
  10. 2026-07-27 22:04 UTCVendor advisory
  11. 2026-07-27 22:04 UTCGHSA enrichment
  12. 2026-07-27 17:58 UTCEG score recompute
  13. 2026-07-27 17:58 UTCVendor advisory
  14. 2026-07-27 17:58 UTCGHSA enrichment
  15. 2026-07-27 14:14 UTCEPSS rescore
  16. 2026-07-27 11:48 UTCVendor advisory
  17. 2026-07-27 11:48 UTCGHSA enrichment
  18. 2026-07-27 07:52 UTCVendor advisory
  19. 2026-07-27 07:52 UTCGHSA enrichment
  20. 2026-07-27 03:55 UTCVendor advisory
  21. 2026-07-27 03:55 UTCGHSA enrichment
  22. 2026-07-26 23:59 UTCVendor advisory
  23. 2026-07-26 23:59 UTCGHSA enrichment
  24. 2026-07-26 20:01 UTCVendor advisory
  25. 2026-07-26 20:01 UTCGHSA enrichment
Show 75 more
  1. 2026-07-26 16:04 UTCEG score recompute
  2. 2026-07-26 16:04 UTCVendor advisory
  3. 2026-07-26 16:04 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-25 14:18 UTCEPSS rescore
  6. 2026-07-24 14:18 UTCEPSS rescore
  7. 2026-07-24 14:18 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 03:22 UTCEG score recompute
  11. 2026-07-22 14:08 UTCEPSS rescore
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:25 UTCEPSS rescore
  14. 2026-07-21 15:25 UTCEPSS rescore
  15. 2026-07-20 17:08 UTCEPSS rescore
  16. 2026-07-19 14:31 UTCEPSS rescore
  17. 2026-07-19 02:29 UTCEPSS rescore
  18. 2026-07-18 10:04 UTCEPSS rescore
  19. 2026-07-17 02:55 UTCVendor advisory
  20. 2026-07-17 02:55 UTCGHSA enrichment
  21. 2026-07-16 22:53 UTCVendor advisory
  22. 2026-07-16 22:53 UTCGHSA enrichment
  23. 2026-07-16 18:57 UTCVendor advisory
  24. 2026-07-16 18:57 UTCGHSA enrichment
  25. 2026-07-16 17:03 UTCEPSS rescore
  26. 2026-07-16 11:19 UTCVendor advisory
  27. 2026-07-16 11:19 UTCGHSA enrichment
  28. 2026-07-16 07:15 UTCVendor advisory
  29. 2026-07-16 07:15 UTCGHSA enrichment
  30. 2026-07-16 02:15 UTCVendor advisory
  31. 2026-07-16 02:15 UTCGHSA enrichment
  32. 2026-07-15 22:19 UTCVendor advisory
  33. 2026-07-15 22:19 UTCGHSA enrichment
  34. 2026-07-15 18:23 UTCVendor advisory
  35. 2026-07-15 18:23 UTCGHSA enrichment
  36. 2026-07-15 16:57 UTCEPSS rescore
  37. 2026-07-15 14:25 UTCVendor advisory
  38. 2026-07-15 14:25 UTCGHSA enrichment
  39. 2026-07-15 10:27 UTCVendor advisory
  40. 2026-07-15 10:27 UTCGHSA enrichment
  41. 2026-07-15 06:21 UTCVendor advisory
  42. 2026-07-15 06:21 UTCGHSA enrichment
  43. 2026-07-15 02:00 UTCEPSS rescore
  44. 2026-07-15 00:52 UTCEG score recompute▲ 2.80
  45. 2026-07-15 00:52 UTCVendor advisory
  46. 2026-07-15 00:52 UTCGHSA enrichment
  47. 2026-07-14 16:03 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  48. 2026-07-14 12:18 UTCVendor advisory
  49. 2026-07-14 12:18 UTCGHSA enrichment
  50. 2026-07-14 00:00 UTCVendor advisory
  51. 2026-07-14 00:00 UTCGHSA enrichment
  52. 2026-07-13 22:31 UTCEPSS rescore
  53. 2026-07-13 11:42 UTCVendor advisory
  54. 2026-07-13 11:42 UTCGHSA enrichment
  55. 2026-07-13 06:13 UTCEPSS rescore
  56. 2026-07-13 06:13 UTCEPSS rescore
  57. 2026-07-12 23:24 UTCVendor advisory
  58. 2026-07-12 23:24 UTCGHSA enrichment
  59. 2026-07-12 11:05 UTCVendor advisory
  60. 2026-07-12 11:05 UTCGHSA enrichment
  61. 2026-07-12 05:46 UTCEPSS rescore
  62. 2026-07-11 22:47 UTCVendor advisory
  63. 2026-07-11 22:47 UTCGHSA enrichment
  64. 2026-07-11 10:29 UTCVendor advisory
  65. 2026-07-11 10:29 UTCGHSA enrichment
  66. 2026-07-11 08:27 UTCEPSS rescore
  67. 2026-07-11 08:27 UTCEPSS rescore
  68. 2026-07-10 22:11 UTCVendor advisory
  69. 2026-07-10 22:11 UTCGHSA enrichment
  70. 2026-07-10 09:50 UTCVendor advisory
  71. 2026-07-10 09:50 UTCGHSA enrichment
  72. 2026-07-09 21:29 UTCVendor advisory
  73. 2026-07-09 21:29 UTCGHSA enrichment
  74. 2026-07-09 19:10 UTCEPSS rescore
  75. 2026-07-09 19:10 UTCEPSS rescore

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 0% probability of exploitation in the next 30 days, which ranks it in the top 71.8% 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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