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GHSA-5CJR-MXJ5-WMRX

Vulnerability from github – Published: 2026-07-02 20:27 – Updated: 2026-08-05 12:44
VLAI
Summary
SimpleSAMLphp has Possible DoS via XPath Transform
Details

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.20.2"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.20.0"
            },
            {
              "fixed": "4.20.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.20.2"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2-legacy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.20.0"
            },
            {
              "fixed": "4.20.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.19.2"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.19.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.19.2"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2-legacy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.19.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49289"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T20:27:23Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThis 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).\n\n## Impact\n\nAn 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.",
  "id": "GHSA-5cjr-mxj5-wmrx",
  "modified": "2026-08-05T12:44:43Z",
  "published": "2026-07-02T20:27:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/simplesamlphp/saml2/security/advisories/GHSA-5cjr-mxj5-wmrx"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/simplesamlphp/saml2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SimpleSAMLphp has Possible DoS via XPath Transform"
}



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