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

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Summary

CVECVE-2026-9658
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 13:16:25 UTC
Updated2026-05-29 15:29:42 UTC
DescriptionPlack::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.

Risk And Classification

Problem Types: CWE-113 | CWE-790 | CWE-790 CWE-790 Improper Filtering of Special Elements | CWE-113 CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA RRWO PlackMiddlewareSecurityCommon affected 0.13.1 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/RRWO/Plack-Middleware-Security-Simple-v0.13.1/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/05/28/9 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to 0.13.1 or later.

Workarounds

CNA: Use with the the the non_printable_chars rule to block header injections.

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