Vulnerability in Simplesamlphp Xml-Security
CVE-2026-32600
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.
EPSS: 0.001 (4.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Simplesamlphp Xml-security — versions >= 2.0.0, < 2.3.1, < 1.13.9
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-32600?
- CVE-2026-32600 is a high-severity vulnerability in Simplesamlphp Xml-Security, classified under Improper Validation of Integrity Check Value. CVSS score: 8.2/10. Published 2026-03-16.
- How severe is CVE-2026-32600?
- High severity. CVSS v3 base score is 8.2 out of 10.