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CVE-2026-42545— Granian: DoS via WSGI response header panic

Quick assessment

Affected
emmett-framework granian
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.

granian是Emmett开源的一款基于Rust的高性能Python HTTP服务器。 granian 0.2.0版本至2.7.4版本存在安全漏洞，该漏洞源于WSGI应用程序返回无效HTTP响应标头名称或值时，Granian中止工作进程。

CVSS 5.9 · Medium EPSS 0.37% · P28

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
emmett-framework granian >= 0.2.0, < 2.7.4 affected
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I. Basic Information for CVE-2026-42545

Vulnerability Information
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Vulnerability Title
Granian: DoS via WSGI response header panic
Source: CVE Program / CVE List V5
Vulnerability Description
Granian is a Rust HTTP server for Python applications. From 0.2.0 to 2.7.4, Granian aborts a worker process if a WSGI application returns an invalid HTTP response header name or value. The WSGI response conversion path uses .unwrap() on both the header name and header value constructors, so malformed output from the application becomes a process abort instead of a handled error. This vulnerability is fixed in 2.7.4.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
granian 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
granian是Emmett开源的一款基于Rust的高性能Python HTTP服务器。 granian 0.2.0版本至2.7.4版本存在安全漏洞，该漏洞源于WSGI应用程序返回无效HTTP响应标头名称或值时，Granian中止工作进程。
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
emmett-framework granian >= 0.2.0, < 2.7.4 -

II. Public POCs for CVE-2026-42545

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III. Intelligence Information for CVE-2026-42545

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Vendor Advisories for CVE-2026-42545 (1)

IV. Related Vulnerabilities

Same product: granian
Same vendor: emmett-framework
Same weakness: CWE-248

V. Comments for CVE-2026-42545

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