{"action":"Upgrade php-guzzlehttp-psr7 to 2.12.1-1 or later.","affected":[{"fixed":"2.12.1-1","introduced":"0"}],"component":"php-guzzlehttp-psr7","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["2.12.1-1"],"id":"tcs_01M5NT0MXEPG3H8Q8BAKYBAGNW","modified_at":"2026-10-26T12:00:46.084715992Z","published_at":"2026-06-23T16:17:03.127Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-55766","https://security-tracker.debian.org/tracker/CVE-2026-55766"],"severity":{"label":"medium","score":4.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-55766#Debian:14/php-guzzlehttp-psr7","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-55766"}],"summary":"guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.1, guzzlehttp/psr7 did not reject CR/LF characters in certain first-party HTTP start-line fields: the request metho"}