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TI-2026-24841 Aliases CVE-2026-32313GHSA-4v26-v6cg-g6f9

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

Priority HIGH 75CWE-354Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00158 5th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed xmlseclibs (robrichards): 3.1.5robrichards/xmlseclibs (Packagist): 3.1.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
robrichardsxmlseclibsbefore 3.1.53.1.5Patch availableCNA
—robrichards/xmlseclibs (Packagist)before 3.1.53.1.5Patch availableGHSA-4v26-v6cg-g6f9
  • xmlseclibs Vendorrobrichards Affected before 3.1.5 Fixed in 3.1.5 Patch available CNA
  • robrichards/xmlseclibs (Packagist) Vendor— Affected before 3.1.5 Fixed in 3.1.5 Patch available GHSA-4v26-v6cg-g6f9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:xmlseclibs_project:xmlseclibs:*:*:*:*:*:*:*:*before 3.1.5VulnerableXmlseclibs Project
  • cpe:2.3:a:xmlseclibs_project:xmlseclibs:*:*:*:*:*:*:*:* Versions before 3.1.5 Vulnerable ·Xmlseclibs Project

Remediation

  • Fix · CNA xmlseclibs (robrichards) Fixed in 3.1.5
  • Fix · GHSA-4v26-v6cg-g6f9 robrichards/xmlseclibs (Packagist) Fixed in 3.1.5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-32313
  2. 2026-10-03 Alias added: GHSA-4v26-v6cg-g6f9

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2019-02593 Improper signature verification in Rob Richards XmlSecLibs CVSS 3.1HIGH 8.8
  • TI-2025-40988 robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences