CVE-2026-9658

HighCVSS 7.3/10Last modified Jun 17, 2026

Description

Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths.

The header injection rule was ineffective at blocking header injections in the request paths unless they were double-encoded, for example,

GET /path\r\nHTTP/1.1\r\nHost: secret.example.com

Note that it is unclear whether request paths with CRLF followed by additional headers would be blocked by reverse proxies, or how they would be processed by Plack-based servers.

Metrics

CVSS 3.1 7.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness enumeration

CWE-113 CWE-790

Affected software

No affected versions have been published.

Timeline

Published: May 28, 2026
Last modified: Jun 17, 2026
NVD status: Deferred

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