CVE-2026-6653

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 22, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Oct 11, 2026
Patch available.
Web page

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
Web page

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

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

Patch Availability(4)

Vendor / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
libxml22.12.3+dfsg-0exp1 ... 2.9.14+dfsg-1.3~deb12u6 (68 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libxml22.12.3+dfsg-0exp1 ... 2.9.14+dfsg-1.3~deb12u6 (49 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libxml22.12.7+dfsg+really2.9.14-2.1 ... 2.15.4+dfsg-1 (31 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libxml22.12.7+dfsg+really2.9.14-2.1 ... 2.14.5+dfsg-0exp2 (12 versions)
  • every version up to 2.14.5+dfsg-0.1: fixed in 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 11× in last 7d / 38× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 564 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 464 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:31 UTCEG score recompute
  2. 2026-10-11 16:46 UTCEG score recompute
  3. 2026-10-11 14:07 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  7. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  8. 2026-10-08 05:35 UTCOSV refresh
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  11. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  12. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  13. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  14. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  17. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  19. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  20. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  21. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  22. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  24. 2026-09-18 11:24 UTCEG score recompute
  25. 2026-09-18 11:24 UTCVendor advisory
Show 75 more
  1. 2026-09-18 11:24 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  2. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-09-14 06:05 UTCVendor advisory
  6. 2026-09-14 06:05 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  7. 2026-09-14 02:08 UTCEG score recompute
  8. 2026-09-14 02:08 UTCVendor advisory
  9. 2026-09-14 02:08 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  10. 2026-09-13 12:46 UTCEG score recompute
  11. 2026-09-13 12:46 UTCVendor advisory
  12. 2026-09-13 12:46 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  13. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  24. 2026-08-31 00:30 UTCVendor advisory
  25. 2026-08-31 00:30 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  26. 2026-08-30 20:33 UTCEG score recompute
  27. 2026-08-30 20:33 UTCVendor advisory
  28. 2026-08-30 20:33 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  29. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  30. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  31. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  32. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  33. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  34. 2026-08-25 06:15 UTCVendor advisory
  35. 2026-08-25 06:15 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  36. 2026-08-25 02:13 UTCVendor advisory
  37. 2026-08-25 02:13 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  38. 2026-08-24 22:15 UTCEG score recompute
  39. 2026-08-24 22:15 UTCVendor advisory
  40. 2026-08-24 22:15 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  41. 2026-08-24 13:56 UTCEG score recompute
  42. 2026-08-24 13:56 UTCVendor advisory
  43. 2026-08-24 13:56 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  44. 2026-08-24 04:59 UTCVendor advisory
  45. 2026-08-24 04:59 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  46. 2026-08-23 23:41 UTCVendor advisory
  47. 2026-08-23 23:41 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  48. 2026-08-23 19:42 UTCVendor advisory
  49. 2026-08-23 19:42 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  50. 2026-08-23 15:46 UTCVendor advisory
  51. 2026-08-23 15:46 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  52. 2026-08-23 11:50 UTCVendor advisory
  53. 2026-08-23 11:50 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  54. 2026-08-23 07:54 UTCVendor advisory
  55. 2026-08-23 07:54 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  56. 2026-08-23 02:48 UTCEG score recompute
  57. 2026-08-23 02:48 UTCVendor advisory
  58. 2026-08-23 02:48 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  59. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  60. 2026-08-22 22:48 UTCEG score recompute
  61. 2026-08-22 22:48 UTCVendor advisory
  62. 2026-08-22 22:48 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  63. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  64. 2026-08-21 22:21 UTCVendor advisory
  65. 2026-08-21 22:21 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  66. 2026-08-21 18:10 UTCVendor advisory
  67. 2026-08-21 18:10 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  68. 2026-08-21 14:14 UTCVendor advisory
  69. 2026-08-21 14:14 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  70. 2026-08-21 09:25 UTCVendor advisory
  71. 2026-08-21 09:25 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  72. 2026-08-21 05:23 UTCVendor advisory
  73. 2026-08-21 05:23 UTCGHSA enrichmentGHSA-v4qw-p44r-qhfg · GitHub severity HIGH · GitHub CVSS 9.8
  74. 2026-08-21 00:16 UTCEG score recompute
  75. 2026-08-21 00:16 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-6653?
CVE-2026-6653 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-6653 published?
The CVE record for CVE-2026-6653 was published on June 22, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-6653 actively exploited?
CVE-2026-6653 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-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?
A fix for CVE-2026-6653 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-6653 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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