# CVE-2026-93711: libdancer2-perl: Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array

CVE-2026-93711 is fixed in libdancer2-perl on 1 platform by DEBIAN-CVE-2026-93711 (version 2.2.2-1), released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-93711
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 22, 2026

## Description

Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array.  The routine removes CR and LF from each header value but not from the name. A name carrying them therefore reaches the PSGI server intact. A server that does not validate keys writes it to the wire, so the bytes after the CRLF arrive as their own header line.  The application has to derive the header name from request data, not just the value.  An attacker who controls that data adds their own headers and splits the response.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libdancer2-perl Debian 14 | 2.2.2-1 | [DEBIAN-CVE-2026-93711](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93711.md) | Oct 4, 2026 |

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Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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