CVE-2026-6986: A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function…
CVE-2026-6986 · Severity: low · CVSS 3.7 · Published 2026-04-25
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 improper verification of cryptographic signature. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 7.21 is capable of addressing this issue. It is advisable to upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.
No. Junglewise Threat Intelligence has no report of CVE-2026-6986 being exploited in the wild.
How severe is CVE-2026-6986?
Low severity, with a CVSS score of 3.7, published 25 April 2026.
Which products and versions are affected?
Cesanta Mongoose. The advisory does not name versions.
Is there a fix for CVE-2026-6986?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-6986?
Check whether you run Cesanta Mongoose. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.