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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| unaffected |
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Vendor Solution
Upgrade to Dancer2 2.2.0 or later.
Tracking
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Tue, 22 Sep 2026 01:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array | |
| Weaknesses | CWE-113 | |
| References |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-09-22T00:52:11.643Z
Reserved: 2026-09-18T15:06:50.792Z
Link: CVE-2026-93711
Vulnrichment
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NVD
Status : Received
Published: 2026-09-22T01:16:55.847
Modified: 2026-09-22T01:16:55.847
Link: CVE-2026-93711
Redhat
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OpenCVE Enrichment
No data.
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CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')