CVE-2022-23476 - CVE House

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Status published High CVE-2022-23476

Unchecked return value from xmlTextReaderExpand in Nokogiri

7.5 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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sparklemotion nokogiri hashmap.c hashmap_set_with_hash heap-based overflow

Authorization header leak in rubygem Mechanize

Improper Handling of Unexpected Data Type in Nokogiri

Uncontrolled Resource Consumption in org.cyberneko.html (nokogiri fork)

Affected Vendor

sparklemotion

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Affected Software

nokogiri

Vulnerable Versions:

>= 1.13.8, < 1.13.10

Timeline

Official Publish: December 8th, 2022

Last Modified: April 23rd, 2025

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-252 CWE-476

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service

T1499.004 Application or System Exploitation

T1489 Service Stop

T1203 Exploitation for Client Execution

T1190 Exploit Public-Facing Application