{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"h2o","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":[],"id":"tcs_01M5NT02WJ9QXJYZQ9ZE93QVNP","modified_at":"2026-10-01T03:03:26.529724338Z","published_at":"2026-07-10T21:16:55.497Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-55213","https://security-tracker.debian.org/tracker/CVE-2026-55213"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-55213","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-55213"}],"summary":"h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib"}