CVE-2026-121969

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    CVE-2026-121969

    Published: 4 Nov 2026Last Modified: 7 Nov 2026

    Summary: netrek-client-cow through 3.3.3 Stack Buffer Overflow via handleSMessage

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121969.json, https://nvd.nist.gov/vuln/detail/CVE-2026-121969, https://www.vulncheck.com/advisories/netrek-client-cow-through-3.3.3-stack-buffer-overflow-via-handlesmessage, https://github.com/quozl/netrek-client-cow/issues/11, https://github.com/quozl/netrek-client-cow/commit/fb322e74abee3b0b76a9c5a31df6aab5585d3127, https://github.com/quozl/netrek-client-cow, https://github.com/quozl/netrek-client-cow/blob/3.3.3/short.c#L949

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -fb322e74abee3b0b76a9c5a31df6aab5585d3127

    Affected versions

    3.3.3
    3.3.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-121969 | CVE-DB