Infinite loop Affecting cesanta/mongoose package, versions [,7.21)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CESANTAMONGOOSE-16300046
- published26 Apr 2026
- disclosed25 Apr 2026
- creditdwBruijn
Introduced: 25 Apr 2026
CVE-2026-6985 (opens in a new tab)How to fix?
Upgrade cesanta/mongoose to version 7.21 or higher.
Overview
cesanta/mongoose is a networking library for C/C++. It implements event-driven non-blocking APIs for TCP, UDP, HTTP, WebSocket, MQTT.
Affected versions of this package are vulnerable to Infinite loop in the handle_opt function of the TCP Option Handler process. An attacker can cause the application to enter an infinite loop by remotely sending requests with zero-length TCP options, resulting in resource exhaustion and denial of service.