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Advisory record · GHSA-xv6h-r36f-3gp5

Keycloak: Denial of Service due to excessive SAMLRequest decompression

CVSS 5.3 MediumEPSS 0.0066 · 51st percentile

Published by the GitHub Advisory Database at 18 Mar 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-saml-adapter-coreMaven<26.5.426.5.4
org.keycloak:keycloak-saml-coreMaven<26.5.426.5.4
org.keycloak:keycloak-servicesMaven<26.5.426.5.4
Identifiers
GHSA-xv6h-r36f-3gp5 · BIT-keycloak-2026-2575 · CVE-2026-2575
Weakness (CWE)
CWE-409
Tags
Published
18 Mar 2026
Updated
6 Oct 2026

Machine-written summary

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

Keycloak's keycloak-saml-adapter-core, keycloak-saml-core and keycloak-services packages before 26.5.4 are vulnerable. An unauthenticated remote attacker can send a highly compressed SAMLRequest through the SAML Redirect Binding, which the server fails to size-limit during decompression, causing an out-of-memory error and process termination. Upgrade to version 26.5.4 or later.

Written 2 Nov 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

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0066, the 51st percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.