CVE-2025-26434

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-09-05. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

In libxml2, there is a possible out of bounds read due to a buffer overflow. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
0.1%
KEV
Not listed

Published

September 5, 2025

Last Modified

September 8, 2025

References (1)

Vendor Advisories for CVE-2025-26434(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
redhatlibxml2-main-2.15.2-0.3.hum12026-04-10redhat

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 3× in last 7d / 14× 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. 2026-07-21 15:24 UTCEPSS rescore
  2. 2026-07-20 17:07 UTCEPSS rescore
  3. 2026-07-18 10:03 UTCEPSS rescore
  4. 2026-07-13 22:29 UTCEPSS rescore
  5. 2026-07-13 22:29 UTCEPSS rescore
  6. 2026-07-09 19:09 UTCEPSS rescore
  7. 2026-07-08 15:14 UTCEPSS rescore
  8. 2026-07-07 13:45 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-01 15:06 UTCEPSS rescore
  11. 2026-06-28 04:55 UTCEPSS rescore
  12. 2026-06-28 04:55 UTCEPSS rescore
  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-27 03:08 UTCEPSS rescore
  15. 2026-06-17 17:52 UTCEPSS rescore
  16. 2026-06-15 17:48 UTCEPSS rescore
  17. 2026-06-14 23:17 UTCEPSS rescore
  18. 2026-06-13 22:59 UTCEPSS rescore
  19. 2026-06-12 23:11 UTCEPSS rescore
  20. 2026-06-11 13:59 UTCEPSS rescore
  21. 2026-06-10 22:18 UTCEPSS rescore
  22. 2026-06-10 13:22 UTCEPSS rescore
  23. 2026-06-08 14:16 UTCEPSS rescore
  24. 2026-06-08 14:16 UTCEPSS rescore
  25. 2026-06-07 15:24 UTCEPSS rescore
Show 17 more
  1. 2026-06-07 15:24 UTCEPSS rescore
  2. 2026-06-05 22:46 UTCEPSS rescore
  3. 2026-06-05 22:46 UTCEPSS rescore
  4. 2026-06-05 06:10 UTCEPSS rescore
  5. 2026-06-05 06:10 UTCEPSS rescore
  6. 2026-06-04 13:11 UTCEPSS rescore
  7. 2026-06-04 13:11 UTCEPSS rescore
  8. 2026-06-01 13:51 UTCEPSS rescore
  9. 2026-06-01 13:51 UTCEPSS rescore
  10. 2026-05-31 22:30 UTCEPSS rescore
  11. 2026-05-31 22:30 UTCEPSS rescore
  12. 2026-05-31 00:16 UTCEPSS rescore
  13. 2026-05-31 00:16 UTCEPSS rescore
  14. 2026-05-29 23:20 UTCEG score recompute
  15. 2026-05-29 23:20 UTCVendor advisory
  16. 2026-05-29 23:20 UTCGHSA enrichment
  17. 2026-05-29 13:44 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-26434?
CVE-2025-26434 is a medium vulnerability published on September 5, 2025. In libxml2, there is a possible out of bounds read due to a buffer overflow. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
When was CVE-2025-26434 disclosed?
CVE-2025-26434 was first published in the National Vulnerability Database on September 5, 2025, with the most recent update on September 8, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-26434 actively exploited?
CVE-2025-26434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-26434?
CVE-2025-26434 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-26434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-26434, 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

Explore the affected products and dependency analysis for CVE-2025-26434

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