CVE-2026-5246Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization
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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
- 5.6 MEDIUM (v3.1, CNA)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
- Weakness (CWE)
- CWE-639, CWE-285
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Analyzed
- Record last updated
- Apr 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cesanta Mongoose cesanta:mongoose | 7.0; 7.1; 7.2; 7.3; 7.4; 7.5; 7.6; 7.7; and 14 more ranges | CNA record |
cesanta mongoose cesanta:mongoose | from 7.0 before 7.21 | NVD |
References
- https://vuldb.com/vuln/354827vdb-entry, technical-description, third-party-advisory
- https://vuldb.com/vuln/354827/ctisignature, permissions-required, vdb-entry
- https://vuldb.com/submit/770104third-party-advisory, vdb-entry
- https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1patch
- https://github.com/cesanta/mongoose/releases/tag/7.21patch, product, release-notes
- https://github.com/cesanta/mongoose/product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.