CVE-2026-62365
Wazuh: Heap Buffer Overflow in DecodeWinevt() join_data Accumulation via Crafted EventChannel XML
Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. DecodeWinevt in src/analysisd/decoders/winevtchannel.c accumulates unnamed Windows EventChannel Data element contents into the fixed 65,535-byte join_data heap buffer but passes the growing content length, rather than the OS_MAXSTR buffer capacity, as the snprintf size. An enrolled agent can submit an EventChannel message containing four maximum-sized unnamed Data elements, causing the fourth accumulation to write beyond join_data and corrupt adjacent heap metadata. The subsequent free of join_data2 causes the wazuh-analysisd process to terminate, stopping log ingestion for all agents handled by that manager. This vulnerability is fixed in 4.14.7.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| wazuh wazuh |
>= 3.9.0, < 4.14.7 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pmCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/wazuh/wazuh/pull/37198CNA: GitHub_M · x_refsource_MISC
- https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7CNA: GitHub_M · x_refsource_MISC
- https://github.com/wazuh/wazuh/releases/tag/v4.14.7CNA: GitHub_M · x_refsource_MISC
- https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7[email protected]
- https://github.com/wazuh/wazuh/pull/37198[email protected]
- https://github.com/wazuh/wazuh/releases/tag/v4.14.7[email protected]
- https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm[email protected]
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