CVE-2026-85440
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.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-85440?
- CVE-2026-85440 is a critical-severity vulnerability, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-09-03.
- How severe is CVE-2026-85440?
- Critical severity. CVSS v3 base score is 9.8 out of 10.