VYPR
High severityNVD Advisory· Published Mar 13, 2026· Updated Mar 16, 2026

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

CVE-2026-32600

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
simplesamlphp/xml-securityPackagist
>= 2.0.0, < 2.3.12.3.1
simplesamlphp/xml-securityPackagist
< 1.13.91.13.9

Affected products

2

Patches

Vulnerability mechanics

References

5

News mentions

0

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