🛡️ CVE-2026-2966 — mongoose

🟢 CVSS 3.7 — Low ⚠️ Exploit Public CWE-310 NVD
3.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Affected software

CVE-2026-2966 is recorded against 1 package.

  • mongoose (fixed in 7.20)

Timeline and source

Published on 23 February 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
github.com
vuldb.com
vuldb.com
vuldb.com

CVE-2026-2966 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 3.7
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-310
Public Exploit ⚠️ Yes
Source NVD
Published 2026-02-23
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
mongoose — 7.20

References

Permissions Required, VDB Entry https://vuldb.com/?ctiid.347333
Third Party Advisory, VDB Entry https://vuldb.com/?id.347333
Third Party Advisory, VDB Entry https://vuldb.com/?submit.755304

Exploit Protection

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CVE-2026-2966 carries CVSS 3.7 Low rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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