Unauthenticated API hang via blocking key reads
Published Mar 17, 2026 · Updated Mar 17, 2026
Denial of service in Wazuh Manager 4.3.0 through 4.14.2 allows remote attackers to hang its API with invalid Bearer-token floods. The access_log middleware calls synchronous generate_keypair disk reads for every Bearer token, blocking the single-threaded asynchronous event loop. No authentication or user interaction is required; sustained concurrency starves legitimate API requests without affecting confidentiality or integrity.
Summary
What happened
Denial of service in Wazuh Manager 4.3.0 through 4.14.2 allows remote attackers to hang its API with invalid Bearer-token floods. The access_log middleware calls synchronous generate_keypair disk reads for every Bearer token, blocking the single-threaded asynchronous event loop. No authentication or user interaction is required; sustained concurrency starves legitimate API requests without affecting confidentiality or integrity.
The record
- CVE
- CVE-2026-25771
- Published
- Mar 17, 2026
- Updated
- Mar 17, 2026
- Vendor
- Wazuh
- Product
- Wazuh
- Classifications
- CWE-400, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 17, 2026CVE publishedPublication date reported by the CVE source.
- Mar 17, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 4.3.0, < 4.14.3
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- wazuh_dos_poc.pyproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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