Vulnerability in Robrichards Xmlseclibs
CVE-2026-32313
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.
EPSS: 0.002 (4.9th 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
- Robrichards Xmlseclibs — versions < 3.1.5
- Xmlseclibs_project Xmlseclibs
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 (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-32313?
- CVE-2026-32313 is a high-severity vulnerability in Robrichards Xmlseclibs, classified under Improper Validation of Integrity Check Value. CVSS score: 8.2/10. Published 2026-03-16.
- How severe is CVE-2026-32313?
- High severity. CVSS v3 base score is 8.2 out of 10.