CVE-2026-5246

A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

CVSS v3 5.6 MEDIUM
CVSS v2.0 5.1 MEDIUM

5.6^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

5.1^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 4.9 / Impact : 6.4

Access Vector NETWORK

Access Complexity HIGH

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/cesanta/mongoose/
https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1
https://github.com/cesanta/mongoose/releases/tag/7.21
https://vuldb.com/submit/770104
https://vuldb.com/vuln/354827
https://vuldb.com/vuln/354827/cti

Configurations

No configuration.

History

02 Apr 2026, 10:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-02 10:16

Updated : 2026-04-03 16:10

NVD link : CVE-2026-5246

Mitre link : CVE-2026-5246

CVE.ORG link : CVE-2026-5246

JSON object : View

Products Affected

No product.

CWE

CWE-285

Improper Authorization

CWE-639

Authorization Bypass Through User-Controlled Key

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