CVE-2021-26528: Cesanta Mongoose

Critical severity, CVSS 9.1. EPSS: 1.5% chance of exploitation in the next 30 days.

The mg_http_serve_file function in Cesanta Mongoose HTTP server 7.0 is vulnerable to remote OOB write attack via connection request after exhausting memory pool.

Affected products

• Cesanta Mongoose: version 7.0 only

Published 2021-02-08. Last modified 2026-06-17.