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CVE-2026-2967— Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source

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，该漏洞源于对组件TCP Sequence Number Handler中文件/src/net_builtin.c的函数getpeer的错误操作，可能导致通信信道源验证不当。

CVSS 3.7 · Low EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-2967

Vulnerability Information
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Vulnerability Title
Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This affects the function getpeer of the file /src/net_builtin.c of the component TCP Sequence Number Handler. The manipulation leads to improper verification of source of a communication channel. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is reported as difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道源的不正确验证
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，该漏洞源于对组件TCP Sequence Number Handler中文件/src/net_builtin.c的函数getpeer的错误操作，可能导致通信信道源验证不当。
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-2026-2967

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III. Intelligence Information for CVE-2026-2967

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Vendor Advisories for CVE-2026-2967 (1)

Other References for CVE-2026-2967 (2)

Same Patch Batch · Cesanta · 2026-02-23 · 3 CVEs total

CVE-2026-2966 3.7 LOW Cesanta Mongoose DNS Transaction ID dns.c mg_sendnsreq random values
CVE-2026-2968 3.7 LOW Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt s

IV. Related Vulnerabilities

Same product: Mongoose
Same vendor: Cesanta
Same weakness: CWE-940

V. Comments for CVE-2026-2967

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