# Nokogiri Command Injection Vulnerability

Advisory record · `GHSA-cr5j-953j-xw5p`

- **Identifiers:** `GHSA-cr5j-953j-xw5p` · `CVE-2019-5477`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-78](https://cwe.mitre.org/data/definitions/78.html)
- **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md)
- **Published:** 19 Aug 2019
- **Updated:** 18 Feb 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Aug 2019, 19:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `nokogiri` (RubyGems): affected `<1.10.4`; fixed in `1.10.4`
- `rexical` (RubyGems): affected `<1.0.7`; fixed in `1.0.7`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.059, the 93rd percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 19 Aug 2019. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-cr5j-953j-xw5p](https://github.com/advisories/GHSA-cr5j-953j-xw5p)
- [OSV: GHSA-cr5j-953j-xw5p](https://osv.dev/vulnerability/GHSA-cr5j-953j-xw5p)
- <https://nvd.nist.gov/vuln/detail/CVE-2019-5477>
- <https://github.com/sparklemotion/nokogiri/issues/1915>
- <https://github.com/sparklemotion/nokogiri/commit/5d30128343573a9428c86efc758ba2c66e9f12dc>
- <https://github.com/tenderlove/rexical/commit/a652474dbc66be350055db3e8f9b3a7b3fd75926>
- <https://hackerone.com/reports/650835>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2019-5477.yml>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rexical/CVE-2019-5477.yml>
- <https://github.com/sparklemotion/nokogiri>
- <https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdoc>
- <https://lists.debian.org/debian-lts-announce/2019/09/msg00027.html>
- <https://lists.debian.org/debian-lts-announce/2022/10/msg00018.html>
- <https://lists.debian.org/debian-lts-announce/2022/10/msg00019.html>

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-cr5j-953j-xw5p>, 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-cr5j-953j-xw5p/>. Everything for agents: <https://agentprime.io/llms.txt>.