Vulnerability in Cesanta Mongoose
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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.002
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md (related, Exploit, Third Party Advisory)
- github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-2966?
- CVE-2026-2966 is a low-severity vulnerability in Cesanta Mongoose, classified under Cryptographic Issues. CVSS score: 3.7/10. Published 2026-02-23.
- How severe is CVE-2026-2966?
- Low severity. CVSS v3 base score is 3.7 out of 10.