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.
| Package | Affected versions | Patched versions |
|---|---|---|
simplesamlphp/xml-securityPackagist | >= 2.0.0, < 2.3.1 | 2.3.1 |
simplesamlphp/xml-securityPackagist | < 1.13.9 | 1.13.9 |
Affected products
2- simplesamlphp/xml-securityv5Range: >= 2.0.0, < 2.3.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-r353-4845-pr5pghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-32600ghsaADVISORY
- github.com/simplesamlphp/xml-security/commit/cad6d57cf0a5a0b7e0cc4e4a5b18752e56eb1520ghsax_refsource_MISCWEB
- github.com/simplesamlphp/xml-security/commit/fdc12449e959c610943f9fd428e95e3832d74c25ghsax_refsource_MISCWEB
- github.com/simplesamlphp/xml-security/security/advisories/GHSA-r353-4845-pr5pghsax_refsource_CONFIRMWEB
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