Vulnerability Description
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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/themoos/core-moos
- https://github.com/themoos/core-moos/blob/ec9c77c68fcbdef8f5e4c60fe243acd223433f
- https://github.com/themoos/core-moos/commit/96c49c5cdda6e07ee734a5324e8d25ba5a7f
- https://github.com/themoos/core-moos/pull/82
- https://www.vulncheck.com/advisories/moos-core-moos-through-10.4.0-moosdb-pre-au
FAQ
What is CVE-2026-85440?
CVE-2026-85440 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 pack...
How severe is CVE-2026-85440?
CVE-2026-85440 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-85440?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.