Integer overflow in Themoos Essential-Moos
CVE-2026-85436
MOOS essential-moos through 10.0.1 contains a buffer overflow vulnerability in CMOOSUDPLink::ReadPktFromArray() that allows remote attackers to corrupt heap memory by sending UDP datagrams with negative declared lengths. Attackers can send crafted UDP packets to the configured UDPListen port to trigger an oversized memcpy operation that writes past the destination buffer, causing heap corruption and denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.021 (81.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.021 · change: +0.009
Affected products
Weakness classification (CWE)
References
- github.com/themoos/essential-moos (Product, product)
- github.com/themoos/essential-moos/blob/b897ea86dba8b61412dc48ac0cfb5ff34cdaf5f6… (technical-description, Patch, Issue Tracking)
- github.com/themoos/essential-moos/commit/613175fcf63fb9c6c5329c4ec57c2d18588b33… (Patch, patch, Issue Tracking)
- github.com/themoos/essential-moos/pull/21 (issue-tracking, Patch, patch, Issue Tracking)
- www.vulncheck.com/advisories/moos-essential-moos-through-10.0.1-pmoosbridge-hea… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-85436?
- CVE-2026-85436 is a high-severity vulnerability in Themoos Essential-Moos, classified under Integer Underflow. CVSS score: 7.5/10. Published 2026-09-03.
- How severe is CVE-2026-85436?
- High severity. CVSS v3 base score is 7.5 out of 10.