CVE-2025-71407

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-25. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Nokogiri before 1.18.3 contains a stack buffer overflow vulnerability in libxml2 when reporting DTD validation errors with long QName prefixes, and a use-after-free vulnerability during validation against untrusted XML Schemas. Attackers can trigger these vulnerabilities by providing malicious DTD content or untrusted XSD files to cause denial of service or potential code execution.

CVSS v3
9.8
EG Score
9.8(high)
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
35%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available. Sources: github.
generic

Nokogiri before 1.18.3 Stack Buffer Overflow and Use-After-Free | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nokogiri-before-stack-buffer-overflow-and-use-after-free
github Patch Available

Nokogiri updates packaged libxml2 to 2.13.6 to resolve CVE-2025-24928 and CVE-2024-56171 · Advisory · sparklemotion/nokogiri · GitHub

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-vvfq-8hwr-qm4m

Vendor Advisories for CVE-2025-71407(1)

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

Affected Packages

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
nokogiri1.0.0 ... 1.9.1 (182 versions)1.18.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 39× in last 7d / 39× 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. 2026-08-30 04:41 UTCEG score recompute
  2. 2026-08-30 04:41 UTCGHSA enrichment
  3. 2026-08-30 01:21 UTCEPSS rescore
  4. 2026-08-30 00:39 UTCGHSA enrichment
  5. 2026-08-29 20:37 UTCGHSA enrichment
  6. 2026-08-29 16:33 UTCGHSA enrichment
  7. 2026-08-29 12:26 UTCGHSA enrichment
  8. 2026-08-29 08:23 UTCGHSA enrichment
  9. 2026-08-29 04:21 UTCGHSA enrichment
  10. 2026-08-29 00:16 UTCEG score recompute
  11. 2026-08-29 00:16 UTCGHSA enrichment
  12. 2026-08-28 21:40 UTCEPSS rescore
  13. 2026-08-28 19:07 UTCGHSA enrichment
  14. 2026-08-28 18:37 UTCGHSA enrichment
  15. 2026-08-28 14:27 UTCGHSA enrichment
  16. 2026-08-28 10:25 UTCGHSA enrichment
  17. 2026-08-28 06:20 UTCGHSA enrichment
  18. 2026-08-28 02:15 UTCGHSA enrichment
  19. 2026-08-27 22:12 UTCGHSA enrichment
  20. 2026-08-27 18:11 UTCEG score recompute
  21. 2026-08-27 18:11 UTCGHSA enrichment
  22. 2026-08-27 14:24 UTCEPSS rescore
  23. 2026-08-27 14:09 UTCGHSA enrichment
  24. 2026-08-27 10:08 UTCGHSA enrichment
  25. 2026-08-27 06:05 UTCGHSA enrichment
Show 14 more
  1. 2026-08-27 01:56 UTCGHSA enrichment
  2. 2026-08-26 21:55 UTCGHSA enrichment
  3. 2026-08-26 17:50 UTCEG score recompute
  4. 2026-08-26 17:50 UTCGHSA enrichment
  5. 2026-08-26 14:45 UTCEPSS rescore
  6. 2026-08-26 13:48 UTCGHSA enrichment
  7. 2026-08-26 09:45 UTCGHSA enrichment
  8. 2026-08-26 05:43 UTCGHSA enrichment
  9. 2026-08-26 01:41 UTCGHSA enrichment
  10. 2026-08-25 21:40 UTCEG score recompute
  11. 2026-08-25 21:40 UTCGHSA enrichment
  12. 2026-08-25 16:24 UTCEG score recompute
  13. 2026-08-25 15:30 UTCEG score recompute
  14. 2026-08-25 15:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-71407?
CVE-2025-71407 is a critical vulnerability published on August 25, 2026. Nokogiri before 1.18.3 contains a stack buffer overflow vulnerability in libxml2 when reporting DTD validation errors with long QName prefixes, and a use-after-free vulnerability during validation against untrusted XML Schemas. Attackers can trigger these vulnerabilities by providing malicious DTD…
When was CVE-2025-71407 disclosed?
CVE-2025-71407 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-71407 actively exploited?
CVE-2025-71407 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 65.3% of all scored CVEs.
What is the CVSS score of CVE-2025-71407?
CVE-2025-71407 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-71407?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-71407, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-71407

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