CVE-2026-126064

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.

• CWE-416

• https://github.com/sparklemotion/nokogiri/commit/b15b518db9fd15fd6b046f73d1439c282e5cc425
• https://github.com/sparklemotion/nokogiri/commit/feaed3c8c9bd9d81d064d4ca09b16044cd705d6f
• https://github.com/sparklemotion/nokogiri/pull/3752
• https://github.com/sparklemotion/nokogiri/releases/tag/v1.19.5
• https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-3w22-6jfg-527w

Published

Nov 10, 2026

Last Modified

Nov 12, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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