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.

CVSS v3 3.7 LOW
CVSS v2.0 2.6 LOW

3.7^/10

CVSS v3 : LOW

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

2.6^/10

CVSS v2.0 : LOW

Vector : AV:N/AC:H/Au:N/C:N/I:P/A:N

Exploitability : 4.9 / Impact : 2.9

Access Vector NETWORK

Access Complexity HIGH

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md	Exploit Third Party Advisory
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md#poc	Exploit Third Party Advisory
https://vuldb.com/?ctiid.347333	Permissions Required VDB Entry
https://vuldb.com/?id.347333	Third Party Advisory VDB Entry
https://vuldb.com/?submit.755304	Third Party Advisory VDB Entry

Configurations

Configuration 1 (hide)

cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-02-23 03:15

Updated : 2026-02-23 20:18

NVD link : CVE-2026-2966

Mitre link : CVE-2026-2966

CVE.ORG link : CVE-2026-2966

JSON object : View

Products Affected

cesanta

mongoose

CWE

CWE-310

Cryptographic Issues

CWE-330

Use of Insufficiently Random Values

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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."}, {"lang": "es", "value": "Se ha identificado una debilidad en Cesanta Mongoose hasta la versi\u00f3n 7.20. El elemento afectado es la funci\u00f3n mg_sendnsreq del archivo /src/dns.c del componente Gestor de ID de Transacci\u00f3n DNS. Ejecutar el argumento random manipulado puede conducir a valores insuficientemente aleatorios. El ataque puede lanzarse de forma remota. El ataque tiene un nivel de complejidad alto y se considera dif\u00edcil de explotar. El exploit se ha puesto a disposici\u00f3n del p\u00fablico y podr\u00eda usarse para ataques. Se contact\u00f3 al proveedor con antelaci\u00f3n sobre esta divulgaci\u00f3n, pero no respondi\u00f3 de ninguna manera."}], "lastModified": "2026-02-23T20:18:06.617", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "83B5780A-1BF9-4983-A2BD-0E278131D841", "versionEndIncluding": "7.20"}], "operator": "OR"}]}], "sourceIdentifier": "cna@vuldb.com"}