CVE-2026-6985

A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of the file /src/net_builtin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.21 is able to resolve this issue. Upgrading the affected component is advised. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.

• CWE-404
• CWE-835

• https://github.com/cesanta/mongoose/releases/tag/7.21Product, Release Notes
• https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.mdExploit, Third Party Advisory
• https://vuldb.com/submit/796230Third Party Advisory, VDB Entry
• https://vuldb.com/vuln/359528Third Party Advisory, VDB Entry
• https://vuldb.com/vuln/359528/ctiPermissions Required, VDB Entry

Published

Apr 25, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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