PT-2026-39558 · Julia · Mongoose Jll

Published 2026-04-30 · Updated 2026-04-30

OSV

CVSS v4.0

2.9

Low

Base vector

AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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.

Exploit

Fix

Related Identifiers

JLSEC-2026-373

Affected Products

Mongoose Jll

References · 6

• 🔥 https://github.com/dwBruijn/CVEs/blob/main/Mongoose/AESGCM.md · Exploit
• https://osv.dev/vulnerability/JLSEC-2026-373 · Vendor Advisory
• https://github.com/cesanta/mongoose/releases/tag/7.21 · Note
• https://vuldb.com/vuln/359529/cti · Note
• https://vuldb.com/vuln/359529 · Note
• https://vuldb.com/submit/796231 · Note