CVE-2026-76781

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-09-17. A secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a nextCatalog element lacks its mandatory catalog attribute, leading to the application crashing and causing a Denial of Service (DoS).

CVSS v3
5.5
EG Score
5.5MEDIUMhigh confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 17, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 17, 2026
Patch available. Sources: redhat.
generic

catalog: Fix NULL deref for nextCatalog without 'catalog' attribute (!442) · Merge requests · GNOME / libxml2 · GitLab

https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442
generic

Client Challenge

https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894
redhat

2519776 – (CVE-2026-76781) CVE-2026-76781 libxml2: libxml2: NULL pointer dereference parsing nextCatalog without catalog attribute

https://bugzilla.redhat.com/show_bug.cgi?id=2519776
redhat Patch Available

CVE-2026-76781 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-76781

Vendor Advisories for CVE-2026-76781(2)

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-2.15.3-0.1.3.hum12026-08-20redhat

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(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 79× 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. 2026-10-03 22:05 UTCEG score recompute
  2. 2026-10-03 22:05 UTCVendor advisory
  3. 2026-10-03 22:05 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 23:31 UTCEG score recompute
  6. 2026-10-02 23:31 UTCVendor advisory
  7. 2026-10-02 23:31 UTCGHSA enrichment
  8. 2026-10-02 00:54 UTCEG score recompute
  9. 2026-10-02 00:54 UTCVendor advisory
  10. 2026-10-02 00:54 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 02:14 UTCEG score recompute
  13. 2026-10-01 02:14 UTCVendor advisory
  14. 2026-10-01 02:14 UTCGHSA enrichment
  15. 2026-09-30 03:41 UTCEG score recompute
  16. 2026-09-30 03:41 UTCVendor advisory
  17. 2026-09-30 03:41 UTCGHSA enrichment
  18. 2026-09-29 15:24 UTCEPSS rescore
  19. 2026-09-29 05:06 UTCEG score recompute
  20. 2026-09-29 05:06 UTCVendor advisory
  21. 2026-09-29 05:06 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 06:32 UTCEG score recompute
  24. 2026-09-28 06:32 UTCVendor advisory
  25. 2026-09-28 06:32 UTCGHSA enrichment
Show 54 more
  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-27 07:59 UTCEG score recompute
  3. 2026-09-27 07:59 UTCVendor advisory
  4. 2026-09-27 07:59 UTCGHSA enrichment
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-26 09:25 UTCEG score recompute
  7. 2026-09-26 09:25 UTCVendor advisory
  8. 2026-09-26 09:25 UTCGHSA enrichment
  9. 2026-09-26 00:28 UTCEPSS rescore
  10. 2026-09-25 10:52 UTCEG score recompute
  11. 2026-09-25 10:52 UTCVendor advisory
  12. 2026-09-25 10:52 UTCGHSA enrichment
  13. 2026-09-24 14:04 UTCEPSS rescore
  14. 2026-09-24 12:19 UTCEG score recompute
  15. 2026-09-24 12:19 UTCVendor advisory
  16. 2026-09-24 12:19 UTCGHSA enrichment
  17. 2026-09-24 12:03 UTCEG score recompute
  18. 2026-09-24 12:03 UTCVendor advisory
  19. 2026-09-24 12:03 UTCGHSA enrichment
  20. 2026-09-23 17:54 UTCEPSS rescore
  21. 2026-09-23 17:28 UTCVendor advisory
  22. 2026-09-23 17:28 UTCGHSA enrichment
  23. 2026-09-22 18:55 UTCEG score recompute
  24. 2026-09-22 18:55 UTCVendor advisory
  25. 2026-09-22 18:54 UTCGHSA enrichment
  26. 2026-09-22 16:01 UTCEPSS rescore
  27. 2026-09-21 21:09 UTCEPSS rescore
  28. 2026-09-21 20:21 UTCEG score recompute
  29. 2026-09-21 20:21 UTCGHSA enrichment
  30. 2026-09-21 20:05 UTCEG score recompute
  31. 2026-09-21 20:05 UTCGHSA enrichment
  32. 2026-09-21 14:52 UTCEG score recompute
  33. 2026-09-21 14:52 UTCGHSA enrichment
  34. 2026-09-20 20:16 UTCEPSS rescore
  35. 2026-09-20 16:15 UTCGHSA enrichment
  36. 2026-09-19 17:42 UTCEG score recompute
  37. 2026-09-19 17:42 UTCGHSA enrichment
  38. 2026-09-18 19:28 UTCEPSS rescore
  39. 2026-09-18 19:09 UTCGHSA enrichment
  40. 2026-09-18 06:24 UTCEG score recompute
  41. 2026-09-18 06:24 UTCGHSA enrichment
  42. 2026-09-18 05:59 UTCEG score recompute
  43. 2026-09-18 05:59 UTCGHSA enrichment
  44. 2026-09-18 05:19 UTCEG score recompute
  45. 2026-09-18 05:19 UTCGHSA enrichment
  46. 2026-09-18 04:39 UTCEG score recompute
  47. 2026-09-18 04:39 UTCGHSA enrichment
  48. 2026-09-17 20:27 UTCEG score recompute
  49. 2026-09-17 20:27 UTCGHSA enrichment
  50. 2026-09-17 19:30 UTCEG score recompute
  51. 2026-09-17 19:30 UTCGHSA enrichment
  52. 2026-09-17 17:57 UTCEG score recompute
  53. 2026-09-17 15:25 UTCEG score recompute
  54. 2026-09-17 15:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76781?
CVE-2026-76781 is a medium vulnerability published on September 17, 2026. A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a nextCatalog element lacks its mandatory catalog attribute, leading to the application crashing and causing a…
When was CVE-2026-76781 disclosed?
CVE-2026-76781 was first published on September 17, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76781 actively exploited?
CVE-2026-76781 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76781?
CVE-2026-76781 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76781?
A fix for CVE-2026-76781 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-76781 are linked in the Vendor Advisories panel on this page.

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