Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections.

For a HEAD request Starman omits chunked framing but still writes the body returned by the application, on both the array and streaming response paths. Responses with a 1xx, 204 or 304 status also carry the body.

On a keep-alive or pipelined connection the client reads those bytes as the start of the next response. A front-end proxy that reuses upstream connections may then pair responses with the wrong requests.

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Fixes

Solution

Upgrade to Starman 0.4019 or later.


Workaround

For deployments that cannot upgrade to 0.4019, enable Plack::Middleware::Head, which removes the body from HEAD responses.

History

Sun, 25 Oct 2026 17:15:00 +0000

Type Values Removed Values Added
Description Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections. For a HEAD request Starman omits chunked framing but still writes the body returned by the application, on both the array and streaming response paths. Responses with a 1xx, 204 or 304 status also carry the body. On a keep-alive or pipelined connection the client reads those bytes as the start of the next response. A front-end proxy that reuses upstream connections may then pair responses with the wrong requests.
Title Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections
Weaknesses CWE-444
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-10-25T16:51:19.961Z

Reserved: 2026-10-23T16:47:20.192Z

Link: CVE-2026-115823

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-25T17:17:01.743

Modified: 2026-10-25T17:17:01.743

Link: CVE-2026-115823

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses