CVE-2025-2559— Org.keycloak/keycloak-services: jwt token cache exhaustion leading to denial of service (dos) in keycloak
I. Basic Information for CVE-2025-2559
Vulnerability Information
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Vulnerability Title
Org.keycloak/keycloak-services: jwt token cache exhaustion leading to denial of service (dos) in keycloak
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak 26.1.4及之前版本存在安全漏洞，该漏洞源于使用JWT令牌进行身份验证时缓存可能无限增长，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | - | 23.0.0 ~ 26.0.11 | - | |
| Red Hat | Red Hat Build of Keycloak | - | cpe:/a:redhat:build_keycloak:26 | |
| Red Hat | Red Hat build of Keycloak 26.0 | 26.0.11-2 ~ * | cpe:/a:redhat:build_keycloak:26.0::el9 | |
| Red Hat | Red Hat build of Keycloak 26.0 | 26.0-12 ~ * | cpe:/a:redhat:build_keycloak:26.0::el9 | |
| Red Hat | Red Hat build of Keycloak 26.0 | 26.0-13 ~ * | cpe:/a:redhat:build_keycloak:26.0::el9 | |
| Red Hat | Red Hat Single Sign-On 7 | - | cpe:/a:redhat:red_hat_single_sign_on:7 |
II. Public POCs for CVE-2025-2559
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|---|
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IV. Related Vulnerabilities
Same weakness: CWE-770
- CVE-2026-42294
Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in W - CVE-2026-42189
Russh: Pre-auth DoS via unbounded allocation in keyboard-int - CVE-2026-42793
Atom table exhaustion via attacker-controlled GraphQL SDL na - CVE-2026-44499
ZEBRA: Permanent Block Discovery Halt via Gossip Queue Satur - CVE-2026-44500
ZEBRA: Allocation Amplification in Inbound Network Deseriali
V. Comments for CVE-2025-2559
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