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CVE-2026-121969netrek-client-cow through 3.3.3 Stack Buffer Overflow via handleSMessage
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.
7.1 HIGHEPSS 0.34%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.1 | HIGH | 4.0VulnCheck (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 6.5 | MEDIUM | 3.1VulnCheck (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-121969
- Status
- Received
- Assigner (CNA)
- VulnCheck
- Published
- Nov 4, 2026
- Last modified
- 2026-11-05 20:17 UTC
- Weaknesses
- CWE-121 · Stack-based Buffer Overflow
Affected Products
As published by the CNA in the CVE record.
quozlnetrek-client-cow1 version range
- through 3.3.3
References
- 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/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127
- 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