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CVE-2026-32600— xml-security is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption

Quick assessment

Affected
simplesamlphp xml-security
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.

xml-security是SimpleSAMLphp开源的一个库。 xml-security 2.3.1之前版本和1.13.9之前版本存在安全漏洞，该漏洞源于使用aes-128-gcm、aes-192-gcm或aes-256-gcm加密的XML节点缺少身份验证标签长度验证，可能导致攻击者暴力破解身份验证标签、恢复GHASH密钥并解密加密节点，或伪造任意密文。

CVSS 8.2 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-32600

Vulnerability Information
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Vulnerability Title
xml-security is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption
Source: CVE Program / CVE List V5
Vulnerability Description
xml-security is a library that implements XML signatures and encryption. Prior to versions 2.3.1 and 1.13.9, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker can use this to brute-force an authentication tag, recover the GHASH key, and decrypt the encrypted nodes. It also allows to forge arbitrary ciphertexts without knowing the encryption key. This vulnerability is fixed in 2.3.1 and 1.13.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
xml-security 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xml-security是SimpleSAMLphp开源的一个库。 xml-security 2.3.1之前版本和1.13.9之前版本存在安全漏洞，该漏洞源于使用aes-128-gcm、aes-192-gcm或aes-256-gcm加密的XML节点缺少身份验证标签长度验证，可能导致攻击者暴力破解身份验证标签、恢复GHASH密钥并解密加密节点，或伪造任意密文。
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 xml-security >= 2.0.0, < 2.3.1 -

II. Public POCs for CVE-2026-32600

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 13137 chars
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III. Intelligence Information for CVE-2026-32600

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Patches & Fixes for CVE-2026-32600 (2)

IV. Related Vulnerabilities

Same product: xml-security
Same vendor: simplesamlphp
Same weakness: CWE-354

V. Comments for CVE-2026-32600

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