CVE-2026-116127

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-55613 uhttpd is a small HTTP server. CWE-444
• CVE-2026-55614 uhttpd is a small HTTP server. CWE-444
• CVE-2026-55612 uhttpd is a small HTTP server. CWE-444
• CVE-2026-91920 A flaw was found in the ChunkReader component of the Undertow web server, which is used… CWE-444
• CVE-2026-118264 Echo is a Go web framework. CWE-444
• CVE-2026-103995 Response body and chunk parsing would handle non-hex or negative integers incorrectly… CWE-444
• CVE-2026-115823 Starman versions before 0.4019 for Perl send response bodies for HEAD requests… CWE-444
• CVE-2026-115877 Twisted is an event-based framework for internet applications, supporting Python 3.6+. CWE-444