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CVE-2026-2968— Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification

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及之前版本存在数据伪造问题漏洞，该漏洞源于对组件Poly1305 Authentication Tag Handler中文件/src/tls_chacha20.c的函数mg_chacha20_poly1305_decrypt的错误操作，可能导致加密签名验证不当。

CVSS 3.7 · Low EPSS 0.27% · P18
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I. Basic Information for CVE-2026-2968

Vulnerability Information
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Vulnerability Title
Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public 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:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
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，该漏洞源于对组件Poly1305 Authentication Tag Handler中文件/src/tls_chacha20.c的函数mg_chacha20_poly1305_decrypt的错误操作，可能导致加密签名验证不当。
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-2026-2968

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III. Intelligence Information for CVE-2026-2968

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Vendor Advisories for CVE-2026-2968 (1)

Other References for CVE-2026-2968 (1)

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-2026-2967 3.7 LOW Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source

IV. Related Vulnerabilities

Same product: Mongoose
Same vendor: Cesanta
Same weakness: CWE-347

V. Comments for CVE-2026-2968

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