CVE-2026-121969
netrek-client-cow through 3.3.3 Stack Buffer Overflow via handleSMessage
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | quozl |
| Product | netrek-client-cow |
| Published | Nov 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
quozl / netrek-client-cow
0 ≤ 3.3.3
References
github.com: https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127 github.com: https://github.com/quozl/netrek-client-cow github.com: https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949 github.com: https://github.com/quozl/netrek-client-cow/issues/11 vulncheck.com: https://www.vulncheck.com/advisories/netrek-client-cow-through-3.3.3-stack-buffer-overflow-via-handlesmessage
Credits
Deus Rex James Cameron