CVE-2026-121969

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.

References

https://www.vulncheck.com/advisories/netrek-client-cow-through-3.3.3-stack-buffer-overflow-via-handlesmessage

https://github.com/quozl/netrek-client-cow/issues/11

https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127

https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949

https://github.com/quozl/netrek-client-cow

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-117080

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4