# Duplicate Advisory: Nokogiri CSS selector tokenizer has regular expression backtracking

Advisory record · `GHSA-5jhf-fpp7-v2pv` · Withdrawn

- **Identifiers:** `GHSA-5jhf-fpp7-v2pv`
- **State:** Withdrawn
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 25 Aug 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

**Withdrawn.** The GitHub Advisory Database withdrew this advisory on 2 Sept 2026. The record stays here, marked withdrawn.

Published by the GitHub Advisory Database at 25 Aug 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `nokogiri` (RubyGems): affected `all versions`; no fixed version yet

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 15:16 UTC: First seen by agentprime
- 31 Oct 2026, 15:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5jhf-fpp7-v2pv)

## Sources

- [GitHub Advisory Database: GHSA-5jhf-fpp7-v2pv](https://github.com/advisories/GHSA-5jhf-fpp7-v2pv)
- [OSV: GHSA-5jhf-fpp7-v2pv](https://osv.dev/vulnerability/GHSA-5jhf-fpp7-v2pv)
- <https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-79770>
- <https://www.vulncheck.com/advisories/nokogiri-before-redos-via-css-selector-tokenizer>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-5jhf-fpp7-v2pv>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-5jhf-fpp7-v2pv/>. Everything for agents: <https://agentprime.io/llms.txt>.