Realm service interruption via newline-bearing security headers
Published Jan 14, 2025 · Updated Aug 31, 2026
Denial of service in Keycloak before 26.0.8 allows remote authenticated users to interrupt an affected realm through security headers. Realm import and update paths accept newline characters in browser-security-header names or values, then apply them to an HTTP response that has already been terminated. A remote authenticated user must hold realm-management rights; exploitation interrupts requests and blocks applications and consoles for that realm.
Summary
What happened
Denial of service in Keycloak before 26.0.8 allows remote authenticated users to interrupt an affected realm through security headers. Realm import and update paths accept newline characters in browser-security-header names or values, then apply them to an HTTP response that has already been terminated. A remote authenticated user must hold realm-management rights; exploitation interrupts requests and blocks applications and consoles for that realm.
The record
- CVE
- CVE-2024-11734
- Published
- Jan 14, 2025
- Updated
- Aug 31, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-693, T1499
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jan 14, 2025CVE publishedPublication date reported by the CVE source.
- Aug 31, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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