{"id":"DEBIAN-CVE-2026-53433","details":"fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to inefficient HTTP body processing using repeated string concatenation, resulting in quadratic time complexity (O(n²)). A crafted POST request with many small segments can trigger excessive CPU usage during request handling.This allows a single malicious request to monopolize the single‑threaded HTTP server, blocking all other clients and resulting in denial of service.  This issue was fixed in version 0.73.1.","modified":"2026-09-14T17:03:46.021396360Z","published":"2026-06-30T13:19:13.407Z","upstream":["CVE-2026-53433"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-53433"}],"affected":[{"package":{"name":"fzf","ecosystem":"Debian:12","purl":"pkg:deb/debian/fzf?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.38.0-1","0.42.0-1","0.44.1-1","0.46.1-1","0.55.0-1","0.56.3-1","0.57.0-1","0.58.0-1","0.60.0-1","0.60.1-1","0.60.2-1","0.60.3-1","0.64.0-1","0.65.1-1","0.66.0-1","0.67.0-1","0.70.0-1","0.72.0-1","0.73.1-1","0.74.1-1","0.74.3-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53433.json"}},{"package":{"name":"fzf","ecosystem":"Debian:13","purl":"pkg:deb/debian/fzf?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.60.3-1","0.64.0-1","0.65.1-1","0.66.0-1","0.67.0-1","0.70.0-1","0.72.0-1","0.73.1-1","0.74.1-1","0.74.3-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53433.json"}},{"package":{"name":"fzf","ecosystem":"Debian:14","purl":"pkg:deb/debian/fzf?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.73.1-1"}]}],"versions":["0.60.3-1","0.64.0-1","0.65.1-1","0.66.0-1","0.67.0-1","0.70.0-1","0.72.0-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53433.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:N/I:N/A:H"}]}