CVE-2022-23476

Name: CVE-2022-23476
Creator: NVD / NIST
Published: 2022-12-08T04:15:09.043+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.68%

Last modified Jun 17, 2026

CVE-2022-23476 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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`. EPSS estimates a 1.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.68%

74.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nokogiri	Nokogiri	1.13.8
Nokogiri	Nokogiri	1.13.9

References

https://github.com/sparklemotion/nokogiri/commit/85410e38410f670cbbc8c5b00d07b843caee88cePatch, Third Party Advisory
https://github.com/sparklemotion/nokogiri/commit/9fe0761c47c0d4270d1a5220cfd25de080350d50Patch, Third Party Advisory
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-qv4q-mr5r-qprjThird Party Advisory
https://github.com/sparklemotion/nokogiri/commit/85410e38410f670cbbc8c5b00d07b843caee88cePatch, Third Party Advisory
https://github.com/sparklemotion/nokogiri/commit/9fe0761c47c0d4270d1a5220cfd25de080350d50Patch, Third Party Advisory
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-qv4q-mr5r-qprjThird Party Advisory

Timeline

Published: Dec 8, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-23476?

How severe is CVE-2022-23476?

CVE-2022-23476 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.68% probability of exploitation in the next 30 days.

How do I fix CVE-2022-23476?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-23476?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST