{"id":"CVE-2026-45798","state":"PUBLISHED","title":"Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field","description":"Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.5.0 until 4.14.6 and 5.0.0-beta2, compare_wazuh_versions() in src/shared/version_op.c copies the attacker-controlled enrollment V: field into a 10-byte stack buffer with strncpy() but does not explicitly terminate the buffer. The function is reachable before authentication through wazuh-authd on TCP port 1515 when anonymous TLS enrollment is enabled. A version string of at least nine non-null bytes can cause strchr() and strtok() to read beyond ver2 and can make strtok() write a null byte into adjacent stack memory, allowing a remote denial of service. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.","publishedAt":"2026-08-19T16:20:54.636Z","updatedAt":"2026-08-19T17:20:26.591Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["wazuh wazuh"],"affected":[{"vendor":"wazuh","product":"wazuh","versions":[{"version":">= 4.5.0, < 4.14.6","status":"affected"},{"version":">= 5.0.0-beta1, < 5.0.0-beta2","status":"affected"}]}],"references":["https://github.com/wazuh/wazuh/security/advisories/GHSA-4fvp-jfc3-qr6r","https://github.com/wazuh/wazuh/pull/36059","https://github.com/wazuh/wazuh/commit/b6aac379982d6144b8da38450cbea6c8dc15be44","https://github.com/wazuh/wazuh/releases/tag/v4.14.6","https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2"],"weaknesses":["CWE-121","CWE-170"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45798.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45798","state":"PUBLISHED","datePublished":"2026-08-19T16:20:54.636Z","dateUpdated":"2026-08-19T17:20:26.591Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-13T08:19:32.603Z"},"containers":{"cna":{"title":"Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field","descriptions":[{"lang":"en","value":"Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.5.0 until 4.14.6 and 5.0.0-beta2, compare_wazuh_versions() in src/shared/version_op.c copies the attacker-controlled enrollment V: field into a 10-byte stack buffer with strncpy() but does not explicitly terminate the buffer. The function is reachable before authentication through wazuh-authd on TCP port 1515 when anonymous TLS enrollment is enabled. A version string of at least nine non-null bytes can cause strchr() and strtok() to read beyond ver2 and can make strtok() write a null byte into adjacent stack memory, allowing a remote denial of service. This issue is fixed in versions 4.14.6 and 5.0.0-beta2."}],"affected":[{"vendor":"wazuh","product":"wazuh","versions":[{"version":">= 4.5.0, < 4.14.6","status":"affected"},{"version":">= 5.0.0-beta1, < 5.0.0-beta2","status":"affected"}]}],"references":[{"url":"https://github.com/wazuh/wazuh/security/advisories/GHSA-4fvp-jfc3-qr6r","name":"https://github.com/wazuh/wazuh/security/advisories/GHSA-4fvp-jfc3-qr6r","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/wazuh/wazuh/pull/36059","name":"https://github.com/wazuh/wazuh/pull/36059","tags":["x_refsource_MISC"]},{"url":"https://github.com/wazuh/wazuh/commit/b6aac379982d6144b8da38450cbea6c8dc15be44","name":"https://github.com/wazuh/wazuh/commit/b6aac379982d6144b8da38450cbea6c8dc15be44","tags":["x_refsource_MISC"]},{"url":"https://github.com/wazuh/wazuh/releases/tag/v4.14.6","name":"https://github.com/wazuh/wazuh/releases/tag/v4.14.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2","name":"https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-121","lang":"en","description":"CWE-121: Stack-based Buffer Overflow","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-170","lang":"en","description":"CWE-170: Improper Null Termination","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-19T16:20:54.636Z"},"source":{"advisory":"GHSA-4fvp-jfc3-qr6r","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-19T17:17:27.587788Z","id":"CVE-2026-45798","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-19T17:20:26.591Z"}}]}}}