Low 3.7Published Feb 22, 2026

CVE-2026-2966Cesanta Mongoose DNS Transaction ID dns.c mg_sendnsreq random values

Updated under an hour ago (Oct 26, 2026, 11:50 PM ET)

This data is behind schedule: last updated Oct 26, 2026, 11:50 PM ET. We are working on it.Behind: CVE records (cvelistV5).

Does this affect you?

It affects Cesanta Mongoose. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Cesanta Mongoose

Exploited in the last 30 days

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.

CVSS: 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
Weakness (CWE): CWE-330, CWE-310
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Analyzed
Record last updated: Feb 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cesanta Mongoose cesanta:mongoose	7.0; 7.1; 7.2; 7.3; 7.4; 7.5; 7.6; 7.7; and 13 more ranges	CNA record
cesanta mongoose cesanta:mongoose	through 7.20	NVD

References

References

https://vuldb.com/?id.347333	vdb-entry, technical-description, third-party-advisory
https://vuldb.com/?ctiid.347333	signature, permissions-required, vdb-entry
https://vuldb.com/?submit.755304	third-party-advisory, vdb-entry
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md	related, exploit, third-party-advisory
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md#poc	exploit, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.