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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116127
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-30 13:18:31 UTC
Updated2026-10-30 17:13:54 UTC
DescriptionStarlet 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.

Risk And Classification

Problem Types: CWE-444 | CWE-444 CWE-444 Inconsistent Interpretation of HTTP Requests

References

ReferenceSourceLinkTags
metacpan.org/release/KAZUHO/Starlet-0.33/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/kazuho/Starlet/commit/859e0c9572cdbed4bb45706d3957b3c025dc0ed... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to Starlet 0.33 or later.

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