CVE-2026-6986 | Cesanta Mongoose up to 7.20 GCM Authentication Tag /src/tls_aes128.c mg_aes_gcm_decrypt signature verification

VDB-359529 · SUBMIT #796231 · CVE-2026-6986 CESANTA MONGOOSE UP TO 7.20 GCM AUTHENTICATION TAG /SRC/TLS_AES128.C MG_AES_GCM_DECRYPT SIGNATURE VERIFICATION HISTORYDIFFRELATEJSONXMLCTI Summaryinfo A vulnerability identified as problematic has been detected in Cesanta Mongoose up to 7.20. Impacted is the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. Performing a manipulation results in signature verification. This vulnerability is cataloged as CVE-2026-6986. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. You should upgrade the affected component. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already. Detailsinfo A vulnerability was found in Cesanta Mongoose up to 7.20. It has been classified as problematic. This affects the function mg_aes_gcm_decrypt of the file /src/tls_aes128.c of the component GCM Authentication Tag Handler. The manipulation with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on integrity. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-6986. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The exploit is shared for download at github.com. It is declared as proof-of-concept. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already. Upgrading to version 7.21 eliminates this vulnerability. The upgrade is hosted for download at github.com. Productinfo Vendor Cesanta Name Mongoose Version 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 7.19 7.20 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.7 VulDB Meta Temp Score: 3.4 VulDB Base Score: 3.7 VulDB Temp Score: 3.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Signature verification CWE: CWE-347 / CWE-345 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Mongoose 7.21 Timelineinfo 04/24/2026 Advisory disclosed 04/24/2026 +0 days VulDB entry created 04/24/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-6986 (🔒) GCVE (CVE): GCVE-0-2026-6986 GCVE (VulDB): GCVE-100-359529 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 04/24/2026 21:18 Changes: 04/24/2026 21:18 (60) Complete: 🔍 Submitter: dwbruijn Cache ID: 99:B19:101 Submitinfo Accepted Submit #796231: Cesanta Mongoose 7.20 Improper Verification of Cryptographic Signature (by dwbruijn) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸