{"affected":[{"product":"wazuh","source":"CNA: GitHub_M","vendor":"wazuh","versions":[{"status":"affected","version":">= 3.9.0, < 4.14.7"}]}],"cveId":"CVE-2026-62365","cwes":["CWE-122"],"description":"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: security-advisories@github.com","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793834276583,"publishedAt":1793832400298,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/pull/37198"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/wazuh/wazuh/releases/tag/v4.14.7"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/wazuh/wazuh/commit/07c5b2829f671eac0436412701a346a26555fdc7"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/wazuh/wazuh/pull/37198"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/wazuh/wazuh/releases/tag/v4.14.7"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-whhr-gxxr-f6pm"}],"remediation":[],"revision":"2cd959a28bdb235cd8a6d4eee871f3ebcef4a2938bfe5f129b13376fdf384f39","sources":[{"modifiedAt":1793832400298,"name":"CNA: GitHub_M","retrievedAt":1793833911085,"url":"https://www.cve.org/CVERecord?id=CVE-2026-62365"},{"modifiedAt":1793834276583,"name":"NVD","retrievedAt":1793838308962,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62365"}],"ssvc":null,"status":"published","title":"Wazuh: Heap Buffer Overflow in DecodeWinevt() join_data Accumulation via Crafted EventChannel XML","updatedAt":1793838308962}