Service crash via offset decompression buffer overflow
Published Aug 19, 2026 · Updated Aug 19, 2026
Out-of-bounds write in Wazuh manager before 4.14.6 and in 5.0.0-beta1 allows remote authenticated users to crash remoted. HandleSecureMessage passes a pointer ten bytes into its stack buffer to ReadSecMSG, which permits os_zlib_uncompress to append a null byte beyond the buffer after a maximum-size expansion. Exploitation requires a valid enrolled agent key and TCP access to port 1514; the build-dependent overwrite can interrupt agent message processing.
Summary
What happened
Out-of-bounds write in Wazuh manager before 4.14.6 and in 5.0.0-beta1 allows remote authenticated users to crash remoted. HandleSecureMessage passes a pointer ten bytes into its stack buffer to ReadSecMSG, which permits os_zlib_uncompress to append a null byte beyond the buffer after a maximum-size expansion. Exploitation requires a valid enrolled agent key and TCP access to port 1514; the build-dependent overwrite can interrupt agent message processing.
The record
- CVE
- CVE-2026-44254
- Published
- Aug 19, 2026
- Updated
- Aug 19, 2026
- Vendor
- Wazuh
- Product
- Wazuh
- Classifications
- CWE-787, CWE-131, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 19, 2026CVE publishedPublication date reported by the CVE source.
- Aug 19, 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=>= 1.0.0, < 4.14.6
- Affected versionversion=>= 5.0.0-beta1, < 5.0.0-beta2
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.
Weakness, pattern, technique
Public exploit references
- Encrypted agent message proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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