{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62365","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-13T22:04:59.677Z","datePublished":"2026-11-04T22:46:40.298Z","dateUpdated":"2026-11-04T22:46:40.298Z"},"containers":{"cna":{"title":"Wazuh: Heap Buffer Overflow in DecodeWinevt() join_data Accumulation via Crafted EventChannel XML","problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122: Heap-based Buffer Overflow","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm"},{"name":"https://github.com/wazuh/wazuh/pull/37198","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/pull/37198"},{"name":"https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7"},{"name":"https://github.com/wazuh/wazuh/releases/tag/v4.14.7","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/releases/tag/v4.14.7"}],"affected":[{"vendor":"wazuh","product":"wazuh","versions":[{"version":">= 3.9.0, < 4.14.7","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-11-04T22:46:40.298Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-whhr-gxxr-f6pm","discovery":"UNKNOWN"}}}}