Low 3.7Published Apr 25, 2026

CVE-2026-6986A security vulnerability has been detected in Cesanta Mongoose up to 7.20.

Updated under an hour ago (2026-10-19 07:50 UTC)

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Every CVE for cesanta mongoose

Exploited in the last 30 days

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.

CVSS: 3.7 LOW (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-345, CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cesanta mongoose cesanta:mongoose	from 7.0 before 7.21	NVD

References

https://github.com/cesanta/mongoose/releases/tag/7.21release-notes
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.mdexploit, third-party-advisory
https://vuldb.com/submit/796231third-party-advisory, vdb-entry
https://vuldb.com/vuln/359529third-party-advisory, vdb-entry
https://vuldb.com/vuln/359529/ctipermissions-required, vdb-entry

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.