GHSA-4v26-v6cg-g6f9: robrichards/xmlseclibs (CVE-2026-32313)

Package	Ecosystem	Affected	Fixed in
robrichards/xmlseclibs	Packagist	<3.1.5	3.1.5

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Robrichards/xmlseclibs versions before 3.1.5 do not validate the length of the authentication tag when decrypting XML nodes encrypted with AES-GCM (128, 192, or 256-bit). An attacker who can supply encrypted XML to a service that decrypts it, such as a SAML service provider, can brute-force the tag and recover the GHASH key, which allows decrypting data and forging ciphertexts. Upgrade to version 3.1.5 or later, and rotate any static symmetric keys that may have been exposed.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0016, the 5th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:02 UTC First seen by agentprime
31 Oct 2026, 14:02 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.