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