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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.

PUBLISHED Reserved 2026-03-31 | Published 2026-04-02 | Updated 2026-04-02 | Assigner VulDB




MEDIUM: 6.3CVSS: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
MEDIUM: 5.6CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
MEDIUM: 5.6CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
5.1AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C

Problem types

Authorization Bypass

Improper Authorization

Product status

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

Timeline

2026-04-02:Advisory disclosed
2026-04-02:VulDB entry created
2026-04-02:VulDB entry last update

Credits

the_evilsocket (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/354827 (VDB-354827 | Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization) vdb-entry technical-description

vuldb.com/vuln/354827/cti (VDB-354827 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/770104 (Submit #770104 | Cesanta Mongoose 7.20 Authorization Bypass) third-party-advisory

github.com/...ommit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1 patch

github.com/cesanta/mongoose/releases/tag/7.21 patch

github.com/cesanta/mongoose/ product

cve.org (CVE-2026-5246)

nvd.nist.gov (CVE-2026-5246)

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