# CVE-2026-85443 — themoos core-moos

> As of 2026-09-03, CVE-2026-85443 is a HIGH-severity vulnerability in themoos core-moos, CVSS v3.1 7.5, EPSS 0.3% (27.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-85443 as of 2026-09-03; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-03

## What is CVE-2026-85443?

MOOS core-moos through 10.4.0 contains a denial of service vulnerability in MOOSCommServer::ListenLoop() where the accept thread performs a blocking receive without timeout during the wire-protocol handshake. An attacker can open a TCP connection to the MOOSDB port and send no data, causing the accept thread to block indefinitely while holding the socket-list lock, preventing all subsequent client connections.

The record classifies CVE-2026-85443 under weakness class [CWE-400](https://intel.threadlinqs.com/cwe/CWE-400). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 32 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **CVSS v4.0 base score:** 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 27.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-03

## Is CVE-2026-85443 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [themoos](https://intel.threadlinqs.com/vendors/themoos): core-moos

## How to fix CVE-2026-85443

No vendor patch reference has been recorded for CVE-2026-85443 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-85443

No threat campaign in the Threadlinqs corpus currently references CVE-2026-85443, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-05. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — issue tracking](https://github.com/themoos/core-moos/pull/83)
- [github.com — patch](https://github.com/themoos/core-moos/commit/8d940303949a850d4625eca2a60f27adee9c3ec4)

**Technical analysis**

- [github.com — technical description](https://github.com/themoos/core-moos/blob/ec9c77c68fcbdef8f5e4c60fe243acd223433f0c/Core/libMOOS/Comms/MOOSCommServer.cpp#L922)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/moos-core-moos-through-10.4.0-moosdb-accept-loop-denial-of-service)

**Issue tracking and product pages**

- [github.com — product](https://github.com/themoos/core-moos)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-85443
Full detection coverage and IOCs for threats exploiting CVE-2026-85443 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp