CVE-2026-79772

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-25. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 25, 2026

Last Modified

September 1, 2026

Advisory Details (1)

Auto-updated Aug 25, 2026
Patch available. Sources: github.
github Patch Available

Unchecked return value from xmlC14NExecute · Advisory · sparklemotion/nokogiri · GitHub

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wx95-c6cv-8532

Vendor Advisories for CVE-2026-79772(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.13.10+dfsg-2 ... 1.19.4+dfsg-1 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.4+dfsg-1 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.18.10+dfsg-1, 1.18.10+dfsg-2, 1.18.10+dfsg-3, 1.18.2+dfsg-11.19.1+dfsg-1—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
nokogiri1.10.0 ... 1.9.1 (155 versions)1.19.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 55× 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. 2026-09-18 19:47 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 21:09 UTCEG score recompute
  4. 2026-09-16 19:23 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 18:55 UTCEG score recompute
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-13 21:38 UTCEG score recompute
  11. 2026-09-12 23:00 UTCEG score recompute
  12. 2026-09-12 00:21 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 01:43 UTCEG score recompute
  16. 2026-09-09 04:25 UTCEG score recompute
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-08 05:47 UTCEG score recompute
  19. 2026-09-07 07:08 UTCEG score recompute
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-06 08:28 UTCEG score recompute
  22. 2026-09-05 09:50 UTCEG score recompute
  23. 2026-09-04 11:12 UTCEG score recompute
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-03 12:34 UTCEG score recompute
Show 30 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-02 13:54 UTCGHSA enrichment
  3. 2026-09-01 15:04 UTCEG score recompute
  4. 2026-09-01 15:04 UTCGHSA enrichment
  5. 2026-09-01 13:54 UTCEPSS rescore
  6. 2026-09-01 04:40 UTCEPSS rescore
  7. 2026-09-01 04:40 UTCEPSS rescore
  8. 2026-08-31 19:36 UTCGHSA enrichment
  9. 2026-08-30 20:44 UTCEG score recompute
  10. 2026-08-30 20:44 UTCGHSA enrichment
  11. 2026-08-30 19:18 UTCEPSS rescore
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 01:22 UTCEPSS rescore
  14. 2026-08-29 22:06 UTCGHSA enrichment
  15. 2026-08-28 23:28 UTCEG score recompute
  16. 2026-08-28 23:28 UTCGHSA enrichment
  17. 2026-08-28 22:51 UTCEG score recompute
  18. 2026-08-28 22:51 UTCGHSA enrichment
  19. 2026-08-28 21:42 UTCEPSS rescore
  20. 2026-08-28 19:07 UTCGHSA enrichment
  21. 2026-08-28 12:24 UTCEG score recompute
  22. 2026-08-28 12:24 UTCGHSA enrichment
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-27 13:45 UTCGHSA enrichment
  25. 2026-08-26 15:06 UTCEG score recompute
  26. 2026-08-26 15:06 UTCGHSA enrichment
  27. 2026-08-26 14:47 UTCEPSS rescore
  28. 2026-08-25 16:24 UTCEG score recompute
  29. 2026-08-25 15:30 UTCEG score recompute
  30. 2026-08-25 15:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-79772?
CVE-2026-79772 is a medium vulnerability published on August 25, 2026. Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid…
When was CVE-2026-79772 disclosed?
CVE-2026-79772 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79772 actively exploited?
CVE-2026-79772 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 83.8% of all scored CVEs.
What is the CVSS score of CVE-2026-79772?
CVE-2026-79772 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-79772?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79772, 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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