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CVE-2026-5246— Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization

Quick assessment

Affected
Cesanta Mongoose
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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及之前版本存在安全漏洞，该漏洞源于P-384 Public Key Handler组件mongoose.c文件中mg_tls_verify_cert_signature函数的操作可能导致授权绕过，可能导致远程攻击。

CVSS 5.6 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5246

Vulnerability Information
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Vulnerability Title
Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_cert_signature authorization
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Cesanta Mongoose 安全漏洞
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及之前版本存在安全漏洞，该漏洞源于P-384 Public Key Handler组件mongoose.c文件中mg_tls_verify_cert_signature函数的操作可能导致授权绕过，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

Vendor Product Affected Versions CPE Subscribe
Cesanta Mongoose 7.0 cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-5246

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III. Intelligence Information for CVE-2026-5246

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Vendor Advisories for CVE-2026-5246 (2)

Other References for CVE-2026-5246 (1)

Same Patch Batch · Cesanta · 2026-04-02 · 3 CVEs total

CVE-2026-5244 7.3 HIGH Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-based overflow
CVE-2026-5245 5.6 MEDIUM Cesanta Mongoose mDNS Record mongoose.c handle_mdns_record stack-based overflow

IV. Related Vulnerabilities

Same product: Mongoose
Same vendor: Cesanta
Same weakness: CWE-639

V. Comments for CVE-2026-5246

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