Vulnerability in Quozl Netrek-Client-Cow
CVE-2026-121968
Netrek-client-cow through 3.3.3 contains an out-of-bounds read vulnerability in short.c handleSMessage() that allows malicious servers to crash clients via an unchecked m_recpt index. Attackers controlling a Netrek server or intercepting the plaintext TCP connection can send SP_S_MESSAGE packets with m_recpt of 36 or more, reading past players[] and shipnos to deny service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/quozl/netrek-client-cow (product)
- github.com/quozl/netrek-client-cow/blob/3.3.3/short.c (technical-description)
- Patch Commit (patch)
- VulnCheck Advisory: Netrek-client-cow through 3.3.3 Out-of-Bounds Read via SP_S_MESSAGE Packets (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121968?
- CVE-2026-121968 is a medium-severity vulnerability in Quozl Netrek-Client-Cow, classified under Improper Validation of Array Index. CVSS score: 6.5/10. Published 2026-11-04.
- How severe is CVE-2026-121968?
- Medium severity. CVSS v3 base score is 6.5 out of 10.