CVE-2026-32313
HIGHxmlseclibs is Missing AES-GCM Authentication Tag Validation on Encrypted Nodes Allows for Unauthorized Decryption
Title source: cnaDescription
xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Prior to 3.1.5, 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 3.1.5.
Scores
CVSS v3
8.2
EPSS
0.0005
EPSS Percentile
15.2%
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)
robrichards/xmlseclibs
0 - 3.1.5Packagist
robrichards/xmlseclibs
< 3.1.5
xmlseclibs_project/xmlseclibs
< 3.1.5
Published
Mar 16, 2026
Tracked Since
Mar 16, 2026