{"id":"CVE-2026-121969","title":"netrek-client-cow through 3.3.3 Stack Buffer Overflow via handleSMessage","summary":"netrek-client-cow through 3.3.3 contains a stack-based buffer overflow vulnerability in handleSMessage() in short.c that allows malicious servers to overflow a 100-byte stack buffer by sending oversized SP_S_MESSAGE packets. A malicious …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-121"],"vendor":"quozl","product":"netrek-client-cow","affected":["netrek-client-cow <= 3.3.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:27:04.770622Z"},"published":"2026-11-04","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:27:21.478Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121969","references":[{"url":"https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127","label":"Patch Commit"},{"url":"https://github.com/quozl/netrek-client-cow"},{"url":"https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949"},{"url":"https://github.com/quozl/netrek-client-cow/issues/11"},{"url":"https://www.vulncheck.com/advisories/netrek-client-cow-through-3.3.3-stack-buffer-overflow-via-handlesmessage","label":"VulnCheck Advisory: netrek-client-cow through 3.3.3 Stack Buffer Overflow via handleSMessage"}],"tags":["cve.org"],"epss":0.00344,"epssPercentile":0.28096,"ingestedAt":"2026-11-05T22:38:31.547Z","slug":"CVE-2026-121969","body":"## Overview\n\nnetrek-client-cow through 3.3.3 contains a stack-based buffer overflow vulnerability in handleSMessage() in short.c that allows malicious servers to overflow a 100-byte stack buffer by sending oversized SP_S_MESSAGE packets. A malicious Netrek server or man-in-the-middle on the plaintext TCP connection can send overlong or unterminated message bodies to write server-controlled bytes onto the stack and crash the client.\n\n## Affected\n\n- `netrek-client-cow <= 3.3.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}