UBUNTU-CVE-2026-121969

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UBUNTU-CVE-2026-121969

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-121969, https://www.cve.org/CVERecord?id=CVE-2026-121969, https://github.com/quozl/netrek-client-cow, https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949, https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127, https://github.com/quozl/netrek-client-cow/issues/11, https://www.vulncheck.com/advisories/netrek-client-cow-through-3.3.3-stack-buffer-overflow-via-handlesmessage