# CVE-2022-23476: ruby-nokogiri: Nokogiri is an open source XML and HTML library for the Ruby programming language

CVE-2022-23476 is fixed in ruby-nokogiri on 1 platform, first by DEBIAN-CVE-2022-23476, released December 8, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-23476
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0182
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 8, 2022

## Description

Nokogiri is an open source XML and HTML library for the Ruby programming language. Nokogiri `1.13.8` and `1.13.9` fail to check the return value from `xmlTextReaderExpand` in the method `Nokogiri::XML::Reader#attribute_hash`. This can lead to a null pointer exception when invalid markup is being parsed. For applications using `XML::Reader` to parse untrusted inputs, this may potentially be a vector for a denial of service attack. Users are advised to upgrade to Nokogiri `>= 1.13.10`. Users may be able to search their code for calls to either `XML::Reader#attributes` or `XML::Reader#attribute_hash` to determine if they are affected.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ruby-nokogiri Debian 12.15 (bookworm) | 1.13.10+dfsg-1 | [DEBIAN-CVE-2022-23476](https://patchblox.com/security/data/fix/linux/debian-cve-2022-23476.md) | Dec 8, 2022 |
| Linux | ruby-nokogiri Debian 13.5 (trixie) | 1.13.10+dfsg-1 | [DEBIAN-CVE-2022-23476](https://patchblox.com/security/data/fix/linux/debian-cve-2022-23476.md) | Dec 8, 2022 |
| Linux | ruby-nokogiri Debian 14 | 1.13.10+dfsg-1 | [DEBIAN-CVE-2022-23476](https://patchblox.com/security/data/fix/linux/debian-cve-2022-23476.md) | Dec 8, 2022 |

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