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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

Quick assessment

Affected
CVE-2026-93711
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 th

EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 2.2.0 affected

I. Basic Information for CVE-2026-93711

Vulnerability Information

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Vulnerability Title
Dancer2 versions before 2.2.0 for Perl do not strip CR and LF from response header names in headers_to_array
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 2.2.0 -

II. Public POCs for CVE-2026-93711

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III. Intelligence Information for CVE-2026-93711

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Patches & Fixes for CVE-2026-93711 (1)

Other References for CVE-2026-93711 (1)

IV. Related Vulnerabilities

Same weakness: CWE-113

V. Comments for CVE-2026-93711

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