CVE-2026-6986
lowpriority · track · 0OT risk · elevatedEPSS 0.002 · 12 %ileEUUSEPSS · scored 2026-10-28
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.7–6.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (22)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://github.com/cesanta/mongoose/releases/Patchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-6986cnnvd
- https://github.com/cesanta/mongoose/releases/tag/7.21enisa_euvd
- https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.mdenisa_euvd
- https://vuldb.com/submit/796231enisa_euvd
- https://vuldb.com/vuln/359529enisa_euvd
- https://vuldb.com/vuln/359529/ctienisa_euvd
- https://github.com/cesanta/mongoose/releases/tag/7.21Release Notesnvd
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