6.9

CVE-2026-79772: nokogiri Unchecked Return Value

CVSS: 6.9v4.0MediumAnalyzed
AliasesUBUNTU-CVE-2026-79772DEBIAN-CVE-2026-79772CGA-476r-93q7-63wv
Published 25-08-2026Last modified 28-08-2026
Open JSON

Vulnerability summary

CVE-2026-79772 is a medium (CVSS 6.9) Unchecked Return Value vulnerability in nokogiri. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.3% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.34%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 1 · Downstream 0 · Related 1
GHSA-XQQH-3W52-Q8P7CGA-99MP-F33P-7V66

Timeline

  1. 25-08-2026
    PublishedVulnerability first disclosed.
  2. 28-08-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

10 scores · 7 sources · 2 versions

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

+0.10 pp

From 0.25% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard58 products
  • gitlab-rails-ce-18.1All versions (No fix recorded)
  • gitlab-rails-ce-18.2All versions (No fix recorded)
  • gitlab-rails-ce-18.3All versions (No fix recorded)
  • gitlab-rails-ce-18.4All versions (No fix recorded)
  • gitlab-rails-ce-18.5All versions (No fix recorded)
Wolfi7 products
  • logstash-9.3All versions (No fix recorded)
  • logstash-9.3-iamguarded-compatAll versions (No fix recorded)
  • logstash-9.3-with-output-opensearchAll versions (No fix recorded)
  • ruby3.2-rails-8.1< 8.1.2-r1
  • ruby3.3-rails-8.1< 8.1.2-r2
Debian1 product
  • ruby-nokogiriAll versions (No fix recorded) | < 1.19.1+dfsg-1
Nokogiri1 product
RubyGems1 product
  • nokogiri≥ 1.5.1, < 1.19.1
Sparklemotion1 product
Ubuntu1 product
  • ruby-nokogiriAll versions (No fix recorded)

7 vendors · 70 products

References

8 links