{"action":"Upgrade curl to 8.21.0~rc2-1 or later.","affected":[{"fixed":"8.21.0~rc2-1","introduced":"0"}],"component":"curl","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["8.21.0~rc2-1"],"id":"tcs_01M5NX157SKAMW80GQ6C0KWRB5","modified_at":"2026-10-01T03:03:56.254863748Z","published_at":"2026-07-03T07:16:25.807Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-9545","https://security-tracker.debian.org/tracker/CVE-2026-9545"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-9545#Debian:14/curl","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-9545"}],"summary":"In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - wi"}