# CVE-2026-115823: starman: Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-ali...

CVE-2026-115823 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-115823, released October 30, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-115823
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0035
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 25, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | perl-Starman Fedora 43 | 0.4019-1.fc43 | [FEDORA-2026-A2DF1DFB37](https://patchblox.com/security/data/fix/linux/fedora-2026-a2df1dfb37.md) | Nov 7, 2026 |
| Linux | starman Debian 14 | 0.4019-1 | [DEBIAN-CVE-2026-115823](https://patchblox.com/security/data/fix/linux/debian-cve-2026-115823.md) | Oct 30, 2026 |

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Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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