Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-25T15:16:04 nokogiri: Nokogiri: Signature validation bypass via unchecked return value 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CWE-252

Nokogiri versions before 1.19.1 fail to check the return value from xmlC14NExecute in the canonicalize method, returning an empty string on failure instead of raising an exception. Attackers can exploit this to bypass signature validation in downstream SAML libraries by providing invalid canonicalized XML that is incorrectly accepted as valid.

A flaw was found in Nokogiri. This vulnerability occurs because the `canonicalize` method fails to properly check the return value from an internal XML processing function, returning an empty string on failure instead of an error. A remote attacker could exploit this by providing specially crafted XML, leading to a bypass of signature validation in Security Assertion Markup Language (SAML) libraries that rely on Nokogiri, potentially allowing malicious data to be accepted as legitimate.

Red Hat 3scale API Management Platform 2 Out of support scope 3scale-amp2/backend-rhel8 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/system-rhel8 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/system-rhel9 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/toolbox-rhel9 Red Hat 3scale API Management Platform 2 Out of support scope 3scale-amp2/zync-rhel9 Red Hat Satellite 6 Not affected tfm-rubygem-amazing_print Red Hat Satellite 6 Fix deferred tfm-rubygem-graphql https://www.cve.org/CVERecord?id=CVE-2026-79772 https://nvd.nist.gov/vuln/detail/CVE-2026-79772 https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wx95-c6cv-8532 https://www.vulncheck.com/advisories/nokogiri-before-unchecked-return-value-canonicalize