# Nokogiri NULL Pointer Dereference

Advisory record · `GHSA-6qvp-r6r3-9p7h`

- **Identifiers:** `GHSA-6qvp-r6r3-9p7h` · `CVE-2018-14404`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-476](https://cwe.mitre.org/data/definitions/476.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Published:** 17 Jan 2019
- **Updated:** 5 Dec 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Jan 2019, 14:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `nokogiri` (RubyGems): affected `<1.8.5`; fixed in `1.8.5`

## 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 3.0: `CVSS:3.0/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:** 0.037, the 89th 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 17 Jan 2019. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-6qvp-r6r3-9p7h](https://github.com/advisories/GHSA-6qvp-r6r3-9p7h)
- [OSV: GHSA-6qvp-r6r3-9p7h](https://osv.dev/vulnerability/GHSA-6qvp-r6r3-9p7h)
- <https://nvd.nist.gov/vuln/detail/CVE-2018-14404>
- <https://github.com/sparklemotion/nokogiri/issues/1785>
- <https://access.redhat.com/errata/RHSA-2019:1543>
- <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901817>
- <https://bugzilla.redhat.com/show_bug.cgi?id=1595985>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2018-14404.yml>
- <https://gitlab.gnome.org/GNOME/libxml2/issues/10>
- <https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html>
- <https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html>
- <https://security.netapp.com/advisory/ntap-20190719-0002>
- <https://usn.ubuntu.com/3739-1>
- <https://usn.ubuntu.com/3739-2>

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-6qvp-r6r3-9p7h>, 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-6qvp-r6r3-9p7h/>. Everything for agents: <https://agentprime.io/llms.txt>.