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CVE-2026-32600

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

Published: Mar 13, 2026Updated: Mar 17, 2026 Sources: CVE List NVD GHSACWE-354
NVD MITRE
8.2CVSSHIGH
EPSS Score
0.1%
Top 95.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-354

Affected Products

xml-securitysimplesamlphp
Library
OSS Libraries / generic-library
simplesamlphp/xml-securityPackagistOSS Libraries
simplesamlphposs-projectOSS Librariesaka simplesamlphp, saml2, xml-security
packagistpackage-ecosystemOSS Libraries

Exploitability

Official Patch Available

References

https://github.com/simplesamlphp/xml-security/commit/cad6d57cf0a5a0b7e0cc4e4a5b18752e56eb1520
github.com
https://github.com/simplesamlphp/xml-security/commit/fdc12449e959c610943f9fd428e95e3832d74c25
github.com
https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-r353-4845-pr5p
github.com
and 2 more references View all →

Timeline

Published
Mar 13, 2026
Last Updated
Mar 17, 2026

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