CVE-2026-93711

Name	CVE-2026-93711
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libdancer2-perl (PTS)	bookworm	0.400001+dfsg-1	vulnerable
	trixie	1.1.2+dfsg-1	vulnerable
	forky, sid	2.1.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libdancer2-perl	source	(unstable)	(unfixed)

Notes

https://lists.security.metacpan.org/cve-announce/msg/43742971/
https://github.com/PerlDancer/Dancer2/issues/1822
Fixed by: https://github.com/PerlDancer/Dancer2/commit/ff89ac12af7b8899812a79e9924dfea7a5d9833b (v2.2.0)