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    CVE-2026-85440

    MOOS core-moos through 10.4.0 contains a pre-authentication heap overflow vulnerability in MOOSCommPkt packet handling that allows remote attackers to write arbitrary data by declaring a negative packet length. Attackers can exploit the signed integer check in InflateTo() and negative size conversion in recv() to overflow a four-byte heap buffer during the HandShake phase before authentication.

    Published:Sep 3, 2026
    Last Modified:Sep 4, 2026
    EPS:Sep 3, 2026
    EPSS Score:0.00552
    CVSS Score:9.8

    Affected Products

    Vendor
    Themoos
    Product
    Core-moos

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-85455 (CVSS 8.8) — MOOS core-moos through 10.4.0 contains a buffer over-read vulnerability in CMOOSCommPkt where a four-byte pack…
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    CVE-2026-85453 (CVSS 5.3) — MOOS core-moos through 10.4.0 fails to escape database contents when rendering MOOSDB HTTP pages, allowing att…
    CVE-2026-85451 (CVSS 7.1) — MOOS core-moos through 10.4.0 contains a remote process termination vulnerability in the SuicidalSleeper compo…
    CVE-2026-85450 (CVSS 8.7) — MOOS core-moos through 10.4.0 contains a denial of service vulnerability in the MOOSDB HTTP server that create…
    CVE-2026-85443 (CVSS 8.7) — MOOS core-moos through 10.4.0 contains a denial of service vulnerability in MOOSCommServer::ListenLoop() where…
    CVE-2026-85442 (CVSS 8.7) — MOOS core-moos through 10.4.0 fails to validate packet length declarations in CMOOSCommPkt::OnBytesWritten(), …
    CVE-2026-85441 (CVSS 8.7) — MOOS core-moos through 10.4.0 fails to validate that serialized string lengths are non-negative in CMOOSMsg::o…
    CVE-2026-85432 (CVSS 8.8) — MOOS core-moos through 10.4.0 fails to validate client identity in MOOSDB message processing, allowing authent…
    CVE-2026-85428 (CVSS 9.3) — MOOS core-moos through 10.4.0 contains an authentication bypass vulnerability in the optional MOOSDB HTTP serv…

    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