CVE-2026-121969 · Package
NO FIX YET · SEE WHAT TO DO
netrek-client-cow through 3.3.3 has a stack buffer overflow in handleSMessage() in short.c. A malicious Netrek server or an attacker on the plaintext connection can send oversized message packets that write server-controlled bytes onto the stack, crashing the client.
first public Nov 4, 2026 · 1 source
Check it with your coding agent
It checks your repository and tells you if you’re affected, with the fix.
Players and operators who connect the netrek-client-cow client to Netrek servers, especially over untrusted networks where the plaintext TCP connection can be intercepted. Systems that never run this client or only connect to trusted servers are lower risk. The sources do not say which builds or platforms are most exposed.
Not affected if client-not-installed, trusted-network-only
Who cares c, netrek, netrek-client-cow
3.3.3 are affected.handleSMessage() function in short.c in your build if you compile from source.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.
This page as .md · .json · 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
. Posts quoted belong to their authors.
Are you affected?
Tell InfraStack what you run. It checks this one, and every next one, against your stack.
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.