CVE-2026-32313
High
Description
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductXmlseclibs
PublishedMar 16, 2026
First seenMar 16, 2026
Weakness typeCWE-354CWE-354
How to fix
Update
- xmlseclibs_project xmlseclibs3.1.5 or later
- robrichards/xmlseclibs3.1.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xmlseclibs_project xmlseclibs | v < 3.1.5 | 3.1.5 |
| robrichards/xmlseclibsPackagist | v < 3.1.5 | 3.1.5 |
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