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Advisory record · GHSA-2935-2wfm-hhpv

Keycloak Denial of Service (DoS) Vulnerability via JWT Token Cache

CVSS 4.9 MediumEPSS 0.0070 · 53rd percentile

Published by the GitHub Advisory Database at 25 Mar 2025, 09:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<=26.1.4No fixed version yet
Identifiers
GHSA-2935-2wfm-hhpv · CVE-2025-2559
Weakness (CWE)
CWE-770
Tags
Published
25 Mar 2025
Updated
30 Apr 2025

Machine-written summary

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

Keycloak (org.keycloak:keycloak-services, versions up to and including 26.1.4) caches JWT tokens until they expire. An attacker who can get clients to use JWT tokens with very long expiration times can make the cache grow without limit, causing an OutOfMemoryError and denial of service for legitimate users. No fix is listed in the source, and it gives few details on the exact preconditions.

Written 7 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
4.9 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0070, the 53rd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:11 UTC First seen by agentprime
  2. 31 Oct 2026, 15:11 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.