CVE-2026-79770
published 2026-08-25CVE-2026-79770: Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and…
PriorityP338high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.49%
41.5th percentile
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.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| 3scale-amp2 | backend-rhel8 | — | — |
| 3scale-amp2 | system-rhel8 | — | — |
| 3scale-amp2 | system-rhel9 | — | — |
| 3scale-amp2 | toolbox-rhel9 | — | — |
| 3scale-amp2 | zync-rhel9 | — | — |
| nokogiri | nokogiri | < 1.19.3 | 1.19.3 |
| sparklemotion | nokogiri | < 1.19.3 | 1.19.3 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat7.5HIGH
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Red Hat
nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
vendor_redhat·2026-08-25·CVSS 7.5
CVE-2026-79770 [HIGH] CWE-1333 nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
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.
A flaw was found in Nokogiri. A remote attacker can inject specially crafted CSS selectors into methods such as `Node#css` or `Node#at_css`. This injection can lead to regular expression denial of service (ReDoS) due to exponential regex backtracking, causing the application to become unresponsive.
Statement: A Regular Expression Denial of Service (ReDoS) vulnerability was discove
GHSA
Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization.
ghsa_unreviewed·2026-08-25
CVE-2026-79770 [HIGH] CWE-1333 Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-79770 rubygem-nokogiri: Nokogiri: Denial of Service via crafted CSS selectors [fedora-all]
bugzilla·2026-08-27·CVSS 7.5
CVE-2026-79770 [HIGH] CVE-2026-79770 rubygem-nokogiri: Nokogiri: Denial of Service via crafted CSS selectors [fedora-all]
CVE-2026-79770 rubygem-nokogiri: Nokogiri: Denial of Service via crafted CSS selectors [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-79770 rubygem-nokogiri: Nokogiri: Denial of Service via crafted CSS selectors [epel-all]
bugzilla·2026-08-27·CVSS 7.5
CVE-2026-79770 [HIGH] CVE-2026-79770 rubygem-nokogiri: Nokogiri: Denial of Service via crafted CSS selectors [epel-all]
CVE-2026-79770 rubygem-nokogiri: Nokogiri: Denial of Service via crafted CSS selectors [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-79770 nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
bugzilla·2026-08-25·CVSS 7.5
CVE-2026-79770 [HIGH] CVE-2026-79770 nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
CVE-2026-79770 nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
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.
2026-08-25
Published