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CVE-2026-116127— Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection

Quick assessment

Affected
CVE-2026-116127
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.

Perl 的 Starlet 框架在 0.33 版本之前，会在处理 HEAD 请求时发送响应体，从而破坏持久连接或管道连接中的下一个响应。 由于请求方法未被传递给响应写入器，应用程序为 HEAD 请求返回的任何响应体都会被原样发送。若使用 Plack::Middleware::Head 中间件，响应体为空，但缺少 Content-Length 头部的 HTTP/1.1 响应仍会附带分块传输编码的终止符。此外，状态码为 204 或 304 的响应也会附带响应体发送。 即使禁用了保持连接（keep-alive，该功能默

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 0.33 affected

I. Basic Information for CVE-2026-116127

Vulnerability Information
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Vulnerability Title
Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection
Source: CVE Program / CVE List V5
Vulnerability Description
Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection. The request method is not passed to the response writer, so whatever body the application returns for a HEAD request is sent. With Plack::Middleware::Head the body is empty, but an HTTP/1.1 response without a Content-Length header still gets the chunked encoding terminator. Responses with status 204 or 304 are also sent with their body. Pipelined GET and HEAD requests keep the connection open even when keep-alive is disabled, which is the default. A client or proxy reading the connection takes the extra bytes as the start of the next response, which may desynchronize a proxy that shares the connection across clients.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 0.33 -

II. Public POCs for CVE-2026-116127

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116127

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Patches & Fixes for CVE-2026-116127 (1)

Vendor Pages for CVE-2026-116127 (1)

IV. Related Vulnerabilities

Same weakness: CWE-444