TI-2026-25110 Aliases CVE-2026-32600 GHSA-r353-4845-pr5p

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

HIGH 75CWE-354Published 2026-03-13 · Updated 2026-03-16

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

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00151 4th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed xml-security (simplesamlphp): 2.3.1, 1.13.9simplesamlphp/xml-security (Packagist): 2.3.1, 1.13.9

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

Vendor	Product	Affected versions	Fixed in	Status	Source
simplesamlphp	xml-security	2.0.0 to before 2.3.1; before 1.13.9	2.3.1, 1.13.9	Patch available	CNA
—	simplesamlphp/xml-security (Packagist)	2.0.0 to before 2.3.1	2.3.1	Patch available	GHSA-r353-4845-pr5p
—	simplesamlphp/xml-security (Packagist)	before 1.13.9	1.13.9	Patch available	GHSA-r353-4845-pr5p

xml-security Vendorsimplesamlphp Affected 2.0.0 to before 2.3.1; before 1.13.9 Fixed in 2.3.1, 1.13.9 Patch available CNA
simplesamlphp/xml-security (Packagist) Vendor— Affected 2.0.0 to before 2.3.1 Fixed in 2.3.1 Patch available GHSA-r353-4845-pr5p
simplesamlphp/xml-security (Packagist) Vendor— Affected before 1.13.9 Fixed in 1.13.9 Patch available GHSA-r353-4845-pr5p

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:simplesamlphp:xml-security::::::::	before 1.13.9; 2.0.0 to before 2.3.1	Vulnerable	simplesamlphp

cpe:2.3:a:simplesamlphp:xml-security:*:*:*:*:*:*:*:* Versions before 1.13.9; 2.0.0 to before 2.3.1 Vulnerable ·simplesamlphp

Remediation

Fix · CNA xml-security (simplesamlphp) Fixed in 2.3.1, 1.13.9
Fix · GHSA-r353-4845-pr5p simplesamlphp/xml-security (Packagist) Fixed in 2.3.1 Advisory →
Fix · GHSA-r353-4845-pr5p simplesamlphp/xml-security (Packagist) Fixed in 1.13.9 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-32600
2026-10-03 Alias added: GHSA-r353-4845-pr5p

References

Exploit 1

https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-r353-4845-pr5p

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-32600

Other 1

https://github.com/simplesamlphp/xml-security

TI-2023-26752 Validation of SignedInfo CVSS 3.1HIGH 7.5

Sources

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