Medium [CVE-2026-79772] Signature validation bypass via unchecked return value
This medium-severity Red Hat Linux advisory covers CVE-2026-79772 affecting Red Hat 3scale API Management Platform 2, Red Hat Satellite 6.
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Summary
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. 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 severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-252.
Affected Red Hat products: Red Hat 3scale API Management Platform 2; Red Hat Satellite 6. Red Hat lists Red Hat Satellite 6 as not affected.
Will not fix / out of support: Red Hat 3scale API Management Platform 2. Red Hat does not currently list a fixing RHSA for this CVE.
- < 1.19.1
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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