PT-2026-55362 · Packagist · Simplesamlphp/Saml2+1

Published 2026-07-02 · Updated 2026-07-02

OSV

CVSS v3.1

7.5

High

Base vector

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

Summary

This library turned out to be vulnerable to Denial-of-Service attacks using XPath transforms. A mitigation has been put in place to restrict the number of transforms and to restrict transforms to only the transform-algorithms mentioned in the SAML 2.0 Core Specifications (and specifically refuse XPath transforms).

Impact

An attacker is able to send specially crafted messages to any entity relying on SimpleSAMLphp (or directly on this SAML2-library) to be able to perform a Denial-of-Service attack.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

GHSA-5CJR-MXJ5-WMRX

Affected Products

Simplesamlphp/Saml2

Simplesamlphp/Saml2-Legacy

References · 3

• https://osv.dev/vulnerability/GHSA-5cjr-mxj5-wmrx · Vendor Advisory
• https://github.com/simplesamlphp/saml2 · Note
• https://github.com/simplesamlphp/saml2/security/advisories/GHSA-5cjr-mxj5-wmrx · Note