{"id":"DEBIAN-CVE-2026-9545","details":"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uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate.  When libcurl returns to the hostname the second time with a cached SSL session (`CURLOPT_SSL_SESSIONID_CACHE` is not disabled) and early data enabled (the `CURLSSLOPT_EARLYDATA` bit is set in `CURLOPT_SSL_OPTIONS`), libcurl might send off the second request's bytes on that new connection *before* enforcing the certificate verification failure. Potentially leaking sensitive information.","modified":"2026-09-16T09:00:21.067951306Z","published":"2026-07-03T07:16:25.807Z","upstream":["CVE-2026-9545"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-9545"}],"affected":[{"package":{"name":"curl","ecosystem":"Debian:13","purl":"pkg:deb/debian/curl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.14.1-2","8.14.1-2+deb13u1","8.14.1-2+deb13u2","8.14.1-2+deb13u2~bpo13+1","8.14.1-2+deb13u3","8.14.1-2+deb13u4","8.14.1-2+deb13u5","8.14.1-2+exp1","8.15.0-1","8.15.0-1~bpo13+1","8.15.0-1~exp1","8.15.0~rc1-1exp1","8.15.0~rc2-1~exp1","8.15.0~rc3-1~exp1","8.16.0-1","8.16.0-1+exp1","8.16.0-1~bpo13+1","8.16.0-2","8.16.0-3","8.16.0-4","8.16.0-4~bpo13+1","8.16.0~rc1-1~exp1","8.16.0~rc2-1","8.16.0~rc2-2","8.16.0~rc3-1","8.17.0-1","8.17.0-2","8.17.0-3","8.17.0~rc1-1~exp1","8.17.0~rc2-1","8.17.0~rc3-1","8.18.0-1","8.18.0-1~bpo13+1","8.18.0-2","8.18.0~rc1-1+exp1","8.18.0~rc2-1","8.18.0~rc3-1","8.19.0-1","8.19.0-1+exp1","8.19.0-1~bpo13+1","8.19.0-2","8.19.0-3","8.19.0-3+exp1","8.19.0-3+exp2","8.19.0~rc1-1~exp1","8.19.0~rc2-1","8.19.0~rc2-2","8.19.0~rc3-1","8.20.0-1","8.20.0-1+exp","8.20.0-2","8.20.0-2+exp1","8.20.0-2~bpo13+1","8.20.0-3","8.20.0-4","8.20.0-5","8.20.0-5~bpo13+1","8.20.0~rc1-1+exp1","8.20.0~rc1-1+exp2","8.20.0~rc1-1+exp3","8.20.0~rc2-1","8.20.0~rc2-1+exp1","8.20.0~rc3-1","8.20.0~rc3-1+exp1","8.21.0-1","8.21.0-1+exp1","8.21.0-2","8.21.0-2+exp1","8.21.0-2~bpo13+1","8.21.0~rc1-1+exp1","8.21.0~rc2-1","8.21.0~rc2-1+exp1","8.21.0~rc3-1","8.21.0~rc3-1+exp1","8.22.0-1","8.22.0-1+exp1","8.22.0~rc2-1","8.22.0~rc2-2","8.22.0~rc3-1","8.22.0~rc3-1+exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9545.json"}},{"package":{"name":"curl","ecosystem":"Debian:14","purl":"pkg:deb/debian/curl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.21.0~rc2-1"}]}],"versions":["8.14.1-2","8.14.1-2+exp1","8.15.0-1","8.15.0-1~bpo13+1","8.15.0-1~exp1","8.15.0~rc1-1exp1","8.15.0~rc2-1~exp1","8.15.0~rc3-1~exp1","8.16.0-1","8.16.0-1+exp1","8.16.0-1~bpo13+1","8.16.0-2","8.16.0-3","8.16.0-4","8.16.0-4~bpo13+1","8.16.0~rc1-1~exp1","8.16.0~rc2-1","8.16.0~rc2-2","8.16.0~rc3-1","8.17.0-1","8.17.0-2","8.17.0-3","8.17.0~rc1-1~exp1","8.17.0~rc2-1","8.17.0~rc3-1","8.18.0-1","8.18.0-1~bpo13+1","8.18.0-2","8.18.0~rc1-1+exp1","8.18.0~rc2-1","8.18.0~rc3-1","8.19.0-1","8.19.0-1+exp1","8.19.0-1~bpo13+1","8.19.0-2","8.19.0-3","8.19.0-3+exp1","8.19.0-3+exp2","8.19.0~rc1-1~exp1","8.19.0~rc2-1","8.19.0~rc2-2","8.19.0~rc3-1","8.20.0-1","8.20.0-1+exp","8.20.0-2","8.20.0-2+exp1","8.20.0-2~bpo13+1","8.20.0-3","8.20.0-4","8.20.0-5","8.20.0-5~bpo13+1","8.20.0~rc1-1+exp1","8.20.0~rc1-1+exp2","8.20.0~rc1-1+exp3","8.20.0~rc2-1","8.20.0~rc2-1+exp1","8.20.0~rc3-1","8.20.0~rc3-1+exp1","8.21.0~rc1-1+exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9545.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}