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CVE-2026-93711

Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-93711

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93711

Published

Dancer2

https://cpan.org/modules

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "modules": [
                        "Dancer2"
                    ],
                    "packageName": "Dancer2",
                    "packageURL": "pkg:cpan/Dancer2",
                    "programFiles": [
                        "lib/Dancer2/Core/Response.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "Dancer2::Core::Response::headers_to_array"
                        }
                    ],
                    "repo": "https://github.com/PerlDancer/Dancer2",
                    "versions": [
                        {
                            "lessThan": "2.2.0",
                            "status": "affected",
                            "version": "0",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON