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CVE-2026-49289— SimpleSAMLphp SAML2: Possible DoS via XPath Transform

Quick assessment

Affected
simplesamlphp saml2
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SimpleSAMLphp saml2是SimpleSAMLphp组织开源的一个身份认证协议实现库。 SimpleSAMLphp saml2 4.19.2版本和4.20.2版本存在资源管理错误漏洞，该漏洞源于处理特制SAML消息中的XML签名时允许攻击者控制的XPath转换，可能允许远程未认证攻击者消耗不受控制的处理资源，从而造成拒绝服务。

CVSS 7.5 · High EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
simplesamlphp saml2 >= 4.19.2, < 4.19.3 affected
>= 4.20.2, < 4.20.3 affected
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I. Basic Information for CVE-2026-49289

Vulnerability Information
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Vulnerability Title
SimpleSAMLphp SAML2: Possible DoS via XPath Transform
Source: CVE Program / CVE List V5
Vulnerability Description
The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. In 4.19.2 and 4.20.2, the library permits attacker-controlled XPath transforms while processing XML signatures in specially crafted SAML messages. XPath evaluation can consume uncontrolled processing resources, allowing a remote unauthenticated attacker to deny service to any entity relying on SimpleSAMLphp or directly on the SAML2 library. The mitigation limits the number of transforms, permits only transform algorithms identified by the SAML 2.0 Core specification, and specifically rejects XPath transforms. This issue is fixed in versions 4.19.3 and 4.20.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
SimpleSAMLphp saml2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SimpleSAMLphp saml2是SimpleSAMLphp组织开源的一个身份认证协议实现库。 SimpleSAMLphp saml2 4.19.2版本和4.20.2版本存在资源管理错误漏洞，该漏洞源于处理特制SAML消息中的XML签名时允许攻击者控制的XPath转换，可能允许远程未认证攻击者消耗不受控制的处理资源，从而造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
simplesamlphp saml2 >= 4.19.2, < 4.19.3 -

II. Public POCs for CVE-2026-49289

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10158 chars
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III. Intelligence Information for CVE-2026-49289

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Patches & Fixes for CVE-2026-49289 (2)

Vendor Advisories for CVE-2026-49289 (1)

IV. Related Vulnerabilities

Same product: saml2
Same vendor: simplesamlphp
Same weakness: CWE-400

V. Comments for CVE-2026-49289

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