How serious is CVE-2026-2966?

This vulnerability has a CVSS score of 6.3 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-2966?

Yes, proof-of-concept exploit code for CVE-2026-2966 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-2966?

CVE-2026-2966 affects cesanta mongoose. Check the full CVE details for specific version information.

How do I fix CVE-2026-2966?

To remediate CVE-2026-2966, check for security patches from cesanta. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-2966

Medium

|6.3

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows an attacker to potentially manipulate DNS requests, which could lead to predictable responses that might be exploited for further attacks. However, successfully exploiting this weakness is complex and requires a high level of skill, making it difficult for most attackers to execute.

Technical 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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$897($500-$1K)

Vendor Response

Grade APatched in 0 days

Quick Information

Published

Feb 23, 2026

about 1 month ago

Last Modified

Feb 23, 2026

about 1 month ago

Vendor

cesanta

Product

mongoose

Related Vulnerabilities

CVE-2026-2967Medium

This vulnerability allows an attacker to potentially impersonate a trusted source in communications with the Cesanta Mongoose software, which could lead to unauthorized access or manipulation of data. However, exploiting this flaw is complex and difficult, requiring specific conditions to be met for a successful attack.