CVE-2026-6986— Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verification
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I. Basic Information for CVE-2026-6986
Vulnerability Information
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Vulnerability Title
Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verification
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cesanta Mongoose 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cesanta Mongoose是爱尔兰Cesanta公司的一套嵌入式服务器库，它包括TCP、HTTP客户端和服务器、WenSocket客户端和服务器等功能。 Cesanta Mongoose 7.20及之前版本存在数据伪造问题漏洞，该漏洞源于组件GCM Authentication Tag Handler中文件/src/tls_aes128.c的函数mg_aes_gcm_decrypt对加密签名验证不当，可能导致远程攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-6986
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- CVE-2026-6986 Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_gcm_decrypt signature verificationvdb-entrytechnical-description
- https://nvd.nist.gov/vuln/detail/CVE-2026-6986
IV. Related Vulnerabilities
Same product: Mongoose
- CVE-2026-6985
Cesanta Mongoose TCP Option net_builtin.c handle_opt infinit - CVE-2026-5246
Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_c - CVE-2026-5245
Cesanta Mongoose mDNS Record mongoose.c handle_mdns_record s - CVE-2026-5244
Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-ba - CVE-2026-2968
Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c
Same vendor: Cesanta
- CVE-2026-6985
Cesanta Mongoose TCP Option net_builtin.c handle_opt infinit - CVE-2026-5246
Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_c - CVE-2026-5245
Cesanta Mongoose mDNS Record mongoose.c handle_mdns_record s - CVE-2026-5244
Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-ba - CVE-2018-25193
Mongoose Web Server 6.9 Denial of Service via Socket Connect
Same weakness: CWE-347
- CVE-2026-42193
Plunk: SNS webhook forgery - CVE-2026-44497
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type - CVE-2026-41669
Admidio: SAML Signature Validation Result Ignored — Forged A - CVE-2026-7689
Dolibarr ERP CRM Online Signature security.lib.php dol_verif - CVE-2026-33467
Improper Verification of Cryptographic Signature in Elastic
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