8.7

CVE-2026-79770: nokogiri

CVSS: 8.7v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-79770DEBIAN-CVE-2026-79770CGA-379p-qjhp-8q98
Published 25-08-2026Last modified 16-09-2026
Open JSON

Vulnerability summary

CVE-2026-79770 is a high (CVSS 8.7) vulnerability in nokogiri. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 41.3% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.49%
0%100%
Low · +0.22 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-5JHF-FPP7-V2PVCGA-Q6XH-8JHV-RXPQ

Timeline

  1. 25-08-2026
    PublishedVulnerability first disclosed.
  2. 16-09-2026
    Last modifiedVulnerability information updated.

Description

Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization. Attackers can inject adversarial CSS selectors into methods like Node#css, Node#at_css, and Searchable#search to cause exponential regex backtracking and denial of service.

CVSS metrics

10 scores · 7 sources · 2 versions

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

+0.22 pp

From 0.28% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.49%

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

Chainguard56 products
  • gitlab-rails-ce-18.1All versions (No fix recorded)
  • gitlab-rails-ce-18.10< 18.10.8-r0
  • gitlab-rails-ce-18.11< 18.11.5-r0
  • gitlab-rails-ce-18.3All versions (No fix recorded)
  • gitlab-rails-ce-18.4All versions (No fix recorded)
Wolfi9 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-kube-logging-operator-fluentd-outputs< 6.5.0-r2
  • ruby3.2-rails-8.1< 8.1.3-r3
Debian1 product
  • ruby-nokogiriAll versions (No fix recorded) | < 1.19.3+dfsg-1
Nokogiri1 product
RubyGems1 product
  • nokogiri< 1.19.3
Sparklemotion1 product
Ubuntu1 product
  • ruby-nokogiriAll versions (No fix recorded)

7 vendors · 70 products

References

8 links