CVE-2026-32600

HIGH

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

Title source: cna

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.

References (3)

[X_Refsource_Confirm] https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-r353-4845-pr5p

[X_Refsource_Misc] https://github.com/simplesamlphp/xml-security/commit/cad6d57cf0a5a0b7e0cc4e4a5b18752e56eb1520

View Writeup ZIP pw:eip

[X_Refsource_Misc] https://github.com/simplesamlphp/xml-security/commit/fdc12449e959c610943f9fd428e95e3832d74c25

Scores

CVSS v3 8.2

EPSS 0.0002

EPSS Percentile 5.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-354

Status published

Products (3)

simplesamlphp/xml-security < 1.13.9 (2 CPE variants)

simplesamlphp/xml-security 2.0.0 - 2.3.1Packagist

simplesamlphp/xml-security >= 2.0.0, < 2.3.1

Published Mar 16, 2026

Tracked Since Mar 16, 2026