Insufficient Randomness in DNS Transaction ID Handler of Cesanta Mongoose by Cesanta
CVE-2026-2966

6.3MEDIUM

Key Information:

Vendor

Cesanta

Status
Mongoose
Vendor
CVE Published:
23 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2966?

A vulnerability has been detected in the DNS Transaction ID handler of Cesanta Mongoose, specifically in the function mg_sendnsreq located in /src/dns.c. This weakness stems from an inability to generate sufficiently random values due to manipulation of the argument 'random'. As a result, this may allow remote attackers to exploit the system with a notable level of complexity. Although the exploit has been publicly disclosed, the vendor did not respond to early communications regarding the issue, indicating potential negligence in addressing the security concern.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

Mongoose 7.0

Mongoose 7.1

Mongoose 7.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-2966 - Proof of Concept

References

https://vuldb.com/?id.347333
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347333
signaturepermissions-required
https://vuldb.com/?submit.755304
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

dwbruijn (VulDB User)
JSON
.