CVE-2025-2559

mediumpriority · track · 0EPSS 0.007 · 53 %ileDEEUNLUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.70% (53rd) EPSS

CVSS 4.9 · medium

Is it mine?

14 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · ncsc_nl

EPSS · scored 2026-10-27

A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication, the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time, for example, 24 or 48 hours, the cache can grow indefinitely, leading to an OutOfMemoryError. This issue could result in a denial of service condition, preventing legitimate users from accessing the system.

cvss

Technical severity, 0–10. One row per scoring source.

4.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · secalert@redhat.com USexploitability 1.2 · impact 3.6

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.14.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770USCWE-770US

affected products (14)

Products and version ranges known to be affected.

Hitachi Ops Centerall versionscert_bundDEcpe:/a:hitachi:ops_center:-
Open Source Keycloakall versionscert_bundDEcpe:/a:keycloak:keycloak:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Red Hat build of Keycloak 26.0< 26.0-12enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.0< 26.0-13enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.0< 26.0.11-2enisa_euvdEU
Red Hat build of Keycloak 26.0≤ vers:rpm/26.0ncsc_nlNLcpe:/a:redhat:build_keycloak:26.0::el9
keycloak-rhel9≤ vers:oci/26.0-1745967474ncsc_nlNLpkg:oci/keycloak-rhel9@sha256:87ff67880fd7f44174b263759c99f4d701cf208eeb6f4abf636a10b98ec023d0?arch=ppc64le&repository_url=registry.redhat.io/rhbk/keycloak-rhel9&tag=26.0-1745967474
keycloak-rhel9-operator≤ vers:oci/26.0-1745967472ncsc_nlNLpkg:oci/keycloak-rhel9-operator@sha256:acd2a3adf7365e62689b79608c2289c804f47f97a81f9e8ddf3fecdce6d6f0ec?arch=s390x&repository_url=registry.redhat.io/rhbk/keycloak-rhel9-operator&tag=26.0-1745967472
Open Source Keycloak≤ vers:unknown/<26.2.2ncsc_nlNL
Red Hat keycloak-rhel9≤ vers:rpm/26.0-12ncsc_nlNL
Red Hat keycloak-rhel9-operator≤ vers:rpm/26.0-13ncsc_nlNL
Red Hat org.keycloak.authentication≤ vers:rpm/unknownncsc_nlNL
Maven org.keycloak:keycloak-services≤ 26.1.4osvUSpkg:maven/org.keycloak/keycloak-services

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2025-0141Kwetsbaarheden verholpen in KeycloakNL2025-05-06csaf · ncsc_nlNL
Red Hat heeft kwetsbaarheden verholpen in Keycloak.
WID-SEC-W-2025-0630Keycloak: Schwachstelle ermöglicht Denial of ServiceDeutsch2025-03-24csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Keycloak ausnutzen, um einen Denial of Service Angriff durchzuführen.
GHSA-2935-2wfm-hhpvKeycloak Denial of Service (DoS) Vulnerability via JWT Token Cache2025-03-25ghsa · osvUS
A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication, the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time, for example, 24 or 48 hours, the cache can grow indefinitely, leading to an OutOfMemoryError. This issue could result in a denial of service condition, preventing legitimate users from accessing the system.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund ncsc_nl osv NVD CVE.org MITRE

published 2025-03-25modified 2026-09-21

references (16)

External citations — patches, advisories, analysis.

scry

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