Vulnerability in Cesanta Mongoose
CVE-2026-6986
A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Such manipulation leads to imprope…
EPSS: 0.000 (0.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- VDB-359529 | Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verification (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-359529 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #796231 | Cesanta Mongoose 7.20 Improper Verification of Cryptographic Signature (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (Exploit, Third Party Advisory, exploit)
- cna@vuldb.com (Release Notes, patch)
Frequently asked questions
- What is CVE-2026-6986?
- CVE-2026-6986 is a low-severity vulnerability in Cesanta Mongoose, classified under Insufficient Verification of Data Authenticity. CVSS score: 3.7/10. Published 2026-04-25.
- How severe is CVE-2026-6986?
- Low severity. CVSS v3 base score is 3.7 out of 10.