CVE-2026-79770
CVSS v3
7.5
HIGH
EPSS Score
0.5 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- nokogiriRubyGemsall versions · fixed in 1.19.3
Vendor advisories
- CVE-2026-79770 Red Hat Product Security
nokogiri: Nokogiri: Denial of Service via crafted CSS selectors
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.
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2026-08-25
- Last Modified
- 2026-08-25
Frequently asked questions
What is CVE-2026-79770?
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Related vulnerabilities
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