GHSA-2qc6-mcvw-92cw

Medium

GitHubnot-fixedPATCH AVAILABLENot Available

GHSA-2qc6-mcvw-92cw

Description

Summary

Nokogiri v1.13.9 upgrades the packaged version of its dependency libxml2 to v2.10.3 from v2.9.14.

libxml2 v2.10.3 addresses the following known vulnerabilities:

Please note that this advisory only applies to the CRuby implementation of Nokogiri < 1.13.9, and only if the packaged libraries are being used. If you've overridden defaults at installation time to use system libraries instead of packaged libraries, you should instead pay attention to your distro's libxml2 release announcements.

Mitigation

Upgrade to Nokogiri >= 1.13.9.

Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile and link Nokogiri against external libraries libxml2 >= 2.10.3 which will also address these same issues.

Impact

libxml2 CVE-2022-2309

CVSS3 score: Under evaluation
Type: Denial of service
Description: NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

Nokogiri maintainers investigated at #2620 and determined this CVE does not affect Nokogiri users.

libxml2 CVE-2022-40304

CVSS3 score: Unspecified upstream
Type: Data corruption, denial of service
Description: When an entity reference cycle is detected, the entity content is cleared by setting its first byte to zero. But the entity content might be allocated from a dict. In this case, the dict entry becomes corrupted leading to all kinds of logic errors, including memory errors like double-frees.

See https://gitlab.gnome.org/GNOME/libxml2/-/commit/644a89e080bced793295f61f18aac8cfad6bece2

libxml2 CVE-2022-40303

CVSS3 score: Unspecified upstream
Type: Integer overflow
Description: Integer overflows with XML_PARSE_HUGE

See https://gitlab.gnome.org/GNOME/libxml2/-/commit/c846986356fc149915a74972bf198abc266bc2c0

References

Summary

Nokogiri v1.13.9 upgrades the packaged version of its dependency libxml2 to v2.10.3 from v2.9.14.

libxml2 v2.10.3 addresses the following known vulnerabilities:

Mitigation

Upgrade to Nokogiri >= 1.13.9.

Impact

libxml2 CVE-2022-2309

CVSS3 score: Under evaluation
Type: Denial of service
Description: NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

Nokogiri maintainers investigated at #2620 and determined this CVE does not affect Nokogiri users.

libxml2 CVE-2022-40304

CVSS3 score: Unspecified upstream
Type: Data corruption, denial of service
Description: When an entity reference cycle is detected, the entity content is cleared by setting its first byte to zero. But the entity content might be allocated from a dict. In this case, the dict entry becomes corrupted leading to all kinds of logic errors, including memory errors like double-frees.

See https://gitlab.gnome.org/GNOME/libxml2/-/commit/644a89e080bced793295f61f18aac8cfad6bece2

libxml2 CVE-2022-40303

CVSS3 score: Unspecified upstream
Type: Integer overflow
Description: Integer overflows with XML_PARSE_HUGE

See https://gitlab.gnome.org/GNOME/libxml2/-/commit/c846986356fc149915a74972bf198abc266bc2c0

References

Impact Assessment

This medium-severity vulnerability could be exploited under certain conditions to compromise security controls or access sensitive information. Should be addressed in a timely manner.

CVSS v3.1 Score

0.0

Quick Facts

PublishedJul 12, 2026

Last ModifiedJul 12, 2026

Discovered ByIndependent Security Researcher

Statusnot-fixed

Attack Metrics

CVSS v3.1 Metrics Breakdown

attack Vector

attack Complexity

privileges Required

user Interaction

scope

Unchanged

confidentiality Impact

Medium

integrity Impact

Medium

availability Impact

Medium

Remediation Guide

How to Fix This Vulnerability

Remediation Steps

1Upgrade the package to version 1.13.9 or later
2Review and audit affected systems for potential exploitation
3Implement additional security controls if immediate patching is not possible
4Monitor for suspicious activity related to this vulnerability

Mitigation Strategies

Immediate Patching

High

Apply security patches to version 1.13.9 immediately

Network Segmentation

Medium

Isolate affected systems from untrusted networks until patching is complete

Monitoring and Detection

Medium

Implement enhanced monitoring for exploitation attempts and unusual behavior

Event History

Vulnerability Timeline

Vulnerability published

2026-07-12T10:20:26Z

published

Patches released: 1.13.9

2026-07-12T10:20:26Z

patched

▪ Common questions

How severe is GHSA-2qc6-mcvw-92cw?

GHSA-2qc6-mcvw-92cw is rated MEDIUM with a CVSS score of 0.

How do I fix GHSA-2qc6-mcvw-92cw?

Upgrade the affected package to 1.13.9.

Back to All Vulnerabilities

GHSA-2qc6-mcvw-92cw

Medium

GitHubnot-fixedPATCH AVAILABLENot Available