Bug 2567675 (CVE-2026-121969)

Summary: CVE-2026-121969 netrek-client-cow: netrek-client-cow: Denial of Service via stack-based buffer overflow in handleSMessage
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in netrek-client-cow. A stack-based buffer overflow vulnerability in the handleSMessage function allows a Denial of Service (DoS). A malicious server or a network attacker on an unencrypted connection can exploit this flaw by sending oversized or improperly terminated message packets. This corrupts stack memory and crashes the client application.
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Description OSIDB Bzimport 2026-11-05 22:17:14 UTC 
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.