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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity High

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00045.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cesanta Mongoose affected
Version Status Constraints
7.0 affected —
7.1 affected —
7.2 affected —
7.3 affected —
7.4 affected —
7.5 affected —
7.6 affected —
7.7 affected —
7.8 affected —
7.9 affected —
7.10 affected —
7.11 affected —
7.12 affected —
7.13 affected —
7.14 affected —
7.15 affected —
7.16 affected —
7.17 affected —
7.18 affected —
7.19 affected —
7.20 affected —
7.21 unaffected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Cesanta Subscribe
Mongoose Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/cesanta/mongoose/ cve-icon cve-icon
https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1 cve-icon cve-icon
https://github.com/cesanta/mongoose/releases/tag/7.21 cve-icon cve-icon
https://vuldb.com/submit/770104 cve-icon cve-icon
https://vuldb.com/vuln/354827 cve-icon cve-icon
https://vuldb.com/vuln/354827/cti cve-icon cve-icon
History

Thu, 02 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 02 Apr 2026 10:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization
First Time appeared Cesanta
Cesanta mongoose
Weaknesses CWE-285
CWE-639
CPEs cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*
Vendors & Products Cesanta
Cesanta mongoose
References
Metrics cvssV2_0

{'score': 5.1, 'vector': 'AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 5.6, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}

cvssV3_1

{'score': 5.6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-04-02T13:07:02.788Z

Reserved: 2026-03-31T14:45:56.419Z

Link: CVE-2026-5246

cve-icon Vulnrichment

Updated: 2026-04-02T13:06:52.126Z

cve-icon NVD

Status : Received

Published: 2026-04-02T10:16:17.763

Modified: 2026-04-02T10:16:17.763

Link: CVE-2026-5246

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses