Vulnerability · Published Sep 22, 2026 · Assigned by CPANSec
CVE-2026-93711Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array
Medium 6.5
In plain English
A medium-severity security flaw in Dancer2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libdancer2-perl | no fix listed | DEBIAN-CVE-2026-93711 |
| Debian:13 | libdancer2-perl | no fix listed | DEBIAN-CVE-2026-93711 |
| Debian:14 | libdancer2-perl | 2.2.2-1 | DEBIAN-CVE-2026-93711 |
| Ubuntu:22.04:LTS | libdancer2-perl | no fix listed | UBUNTU-CVE-2026-93711 |
| Ubuntu:24.04:LTS | libdancer2-perl | no fix listed | UBUNTU-CVE-2026-93711 |
| Ubuntu:26.04:LTS | libdancer2-perl | no fix listed | UBUNTU-CVE-2026-93711 |
| Ubuntu:26.10 | libdancer2-perl | no fix listed | UBUNTU-CVE-2026-93711 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Dancer2 | 0 – before 2.2.0 |
Weakness: CWE-113 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N