{"identifier":"CVE-2026-9658","cve":{"id":"CVE-2026-9658","description":"Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths.\n\nThe header injection rule was ineffective at blocking header injections in the request paths unless they were double-encoded, for example,\n\n  GET /path\\r\\nHTTP/1.1\\r\\nHost: secret.example.com\n\nNote 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.","published":"2026-05-28T13:16:25.067000+00:00","modified":"2026-10-26T11:10:00.157000+00:00","status":"Deferred","score":7.3,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cvss_version":"3.1","affected":[],"weaknesses":["CWE-113","CWE-790"],"references":[{"url":"https://metacpan.org/release/RRWO/Plack-Middleware-Security-Simple-v0.13.1/changes","source":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/28/9","source":"af854a3a-2127-422b-91ae-364da2661108"}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":3.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-01T18:00:08.268723Z","id":"CVE-2026-9658","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[],"source":"nvd","retrieved_at":"2026-10-28T10:25:20.747719+00:00","exploited":false,"kev_stale":false,"products":[],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00226,"percentile":0.13272,"date":"2026-10-27","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"metacpan.org","source_url":"https://metacpan.org/release/RRWO/Plack-Middleware-Security-Simple-v0.13.1/changes","investigate_url":"https://investigate.aeglixmind.com/#metacpan.org"},{"domain":"www.openwall.com","source_url":"http://www.openwall.com/lists/oss-security/2026/05/28/9","investigate_url":"https://investigate.aeglixmind.com/#www.openwall.com"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-9658","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-9658","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-9658","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}