{"action":"Upgrade guzzlehttp/psr7 to 2.12.1 or later.","affected":[{"fixed":"2.12.1","introduced":"0"}],"component":"guzzlehttp/psr7","cve_ids":["CVE-2026-55766"],"ecosystem":"Packagist","epss":0.00229,"exploited":false,"fixed_versions":["2.12.1"],"ghsa_id":"GHSA-vm85-hxw5-5432","id":"tcs_01M5KF98WK82NHC9PRF249G1J8","modified_at":"2026-09-10T03:51:09.646537217Z","published_at":"2026-06-19T14:35:57Z","references":["https://osv.dev/vulnerability/GHSA-vm85-hxw5-5432","https://github.com/guzzle/psr7/security/advisories/GHSA-vm85-hxw5-5432","https://github.com/guzzle/psr7"],"severity":{"label":"medium","score":4.8},"sources":[{"source":"osv","source_id":"GHSA-vm85-hxw5-5432","url":"https://osv.dev/vulnerability/GHSA-vm85-hxw5-5432"}],"summary":"guzzlehttp/psr7: CRLF Injection in HTTP Start-Line Serialization"}