CVE-2026-9658: Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths
RRWO · Plack::Middleware::Security::Common
Fixed in 0.13.1 · Affected: RRWO Plack::Middleware::Security::Common before 0.13.1 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 13% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- RRWO · Plack::Middleware::Security::Commonbefore 0.13.1
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
CoverageNo articles yet
No CyberSIXT article names CVE-2026-9658 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.