CVE-2026-2966

A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

• CWE-310
• CWE-330

• https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.mdExploit, Third Party Advisory
• https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md#pocExploit, Third Party Advisory
• https://vuldb.com/?ctiid.347333Permissions Required, VDB Entry
• https://vuldb.com/?id.347333Third Party Advisory, VDB Entry
• https://vuldb.com/?submit.755304Third Party Advisory, VDB Entry

Published

Feb 23, 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.
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