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Medium

keycloak-core vulnerable to timing attacks against JWS token verification

  • Disclosed: 18.10.2018
  • Updated: 11.10.2026 11:21

Red Hat Keycloak before version 2.5.1 has an implementation of HMAC verification for JWS tokens that uses a method that runs in non-constant time, potentially leaving the application vulnerable to timing attacks.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.keycloak:keycloak-core < 2.5.1 2.5.1

References

CVSS score 5.9/10
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE)
CWE-200
Platform
Java / Kotlin (Maven)
Package
org.keycloak:keycloak-core
Disclosed
18.10.2018
Updated
11.10.2026 11:21

Sources and licenses

OSV / GitHub Advisory Database - GHSA-w6gv-3r3v-gwgj - CC BY 4.0

Vulnerability history: org.keycloak:keycloak-core

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (49) in the archive
Total entries
49
First → latest
10.2018 02.2025
Without a fix
5
Exploited in attacks
0

Severity breakdown

  • Critical 3
  • High 14
  • Medium 31
  • Low 1

Disclosures per year

Severity:
  1. Keycloak mTLS Authentication Bypass via Reverse Proxy TLS Termination
    High · 7.1 CVE-2024-10039 < 26.0.6 26.0.6
  2. Keycloak Denial of Service vulnerability
    High · 6.5 CVE-2023-6841 < 24.0.0 24.0.0
  3. Keycloak vulnerable to Plaintext Storage of User Password
    High · 8.8 CVE-2023-4918 >= 22.0.2, < 22.0.3 22.0.3
  4. Keycloak allows anyone to register new security device or key for any user by using WebAuthn password-less login flow
    High · 7.5 CVE-2021-3632 < 15.1.0 15.1.0
  5. keycloak vulnerable to unauthorized login via mail server setup
    Critical · 9.1 CVE-2019-14837 < 8.0.0 8.0.0
  6. Authentication Bypass in keycloak
    High · 8.8 CVE-2020-27826 < 12.0.0 12.0.0
  7. Temporary Directory Hijacking Vulnerability in Keycloak
    High · 7.3 CVE-2021-20202 < 13.0.0 13.0.0
  8. Improper Input Validation in Keycloak
    High · 8.8 CVE-2020-1714 < 11.0.0 11.0.0
  9. Improper privilege management in Keycloak
    High · 8.1 CVE-2020-14389 < 12.0.0 12.0.0
  10. Privilege Defined With Unsafe Actions in Keycloak
    High · 7.2 CVE-2019-10170 < 8.0.0 8.0.0
  11. keycloak Self Stored Cross-site Scripting vulnerability
    Critical · 9.6 CVE-2021-20195 < 13.0.0 13.0.0
  12. Predictable password in Keycloak
    Critical · 9.8 CVE-2020-1731 < 8.0.2 8.0.2
  13. Improper Input Validation and Cross-Site Request Forgery in Keycloak
    High · 8.8 CVE-2019-10199 < 7.0.0 7.0.0
  14. Improper Authentication in Keycloak
    High · 8.1 CVE-2018-14637 < 4.6.0 4.6.0
  15. Keycloak vulnerable to uncontrolled resource consumption
    High · 7.5 CVE-2014-3651 < 1.0.3 1.0.3
  16. Keycloak vulnerable to infinite loop based Denial of Service
    High · 7.5 CVE-2017-2646 < 2.5.5 2.5.5
  17. Improper Authentication in org.keycloak:keycloak-core
    High · 8.1 CVE-2016-8609 < 2.3.0 2.3.0
  18. keycloak-core vulnerable to timing attacks against JWS token verification this entry
    Medium · 5.9 CVE-2017-2585 < 2.5.1 2.5.1

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