Summary

Nokogiri < v1.13.4 contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to detect encoding in HTML documents.

Mitigation

Upgrade to Nokogiri >= 1.13.4.

Severity

The Nokogiri maintainers have evaluated this as High Severity 7.5 (CVSS3.1).

References

CWE-1333 Inefficient Regular Expression Complexity

Credit

This vulnerability was reported by HackerOne user ooooooo_q (ななおく).

References

• GHSA-crjr-9rc5-ghw8
• https://nvd.nist.gov/vuln/detail/CVE-2022-24836
• sparklemotion/nokogiri@e444525
• https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.4
• https://groups.google.com/g/ruby-security-ann/c/vX7qSjsvWis/m/TJWN4oOKBwAJ?utm_medium=email&utm_source=footer
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OUPLBUZVM4WPFSXBEP2JS3R6LMKRTLFC/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XMDCWRQXJQ3TFSETPCEFMQ6RR6ME5UA3/
• https://lists.debian.org/debian-lts-announce/2022/05/msg00013.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6DHCOWMA5PQTIQIMDENA7R2Y5BDYAIYM/
• https://security.gentoo.org/glsa/202208-29
• https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html
• https://support.apple.com/kb/HT213532
• http://seclists.org/fulldisclosure/2022/Dec/23
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2022-24836.yml