{"id":"CVE-2026-121969","published":"2026-11-04T21:18:06.840","lastModified":"2026-11-04T21:18:06.840","description":"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 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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwes":["CWE-121"],"vendors":[],"products":[],"references":[{"url":"https://github.com/quozl/netrek-client-cow","tags":[]},{"url":"https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949","tags":[]},{"url":"https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127","tags":[]},{"url":"https://github.com/quozl/netrek-client-cow/issues/11","tags":[]},{"url":"https://www.vulncheck.com/advisories/netrek-client-cow-through-3.3.3-stack-buffer-overflow-via-handlesmessage","tags":[]}],"exploitRefs":[{"url":"https://github.com/quozl/netrek-client-cow","tags":[]},{"url":"https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949","tags":[]},{"url":"https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127","tags":[]},{"url":"https://github.com/quozl/netrek-client-cow/issues/11","tags":[]}],"hasPoc":true,"ai":null}