{"id":"CVE-2026-53433","aliases":["DEBIAN-CVE-2026-53433","EUVD-2026-40303","GHSA-mvmf-94v6-879g","GO-2026-6620","UBUNTU-CVE-2026-53433"],"status":"published","title":"Denial of Service in fzf","description":"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.\n\nThis issue was fixed in version 0.73.1.","severity":{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00378,"percentile":0.32207,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-407"],"published":"2026-06-30T12:01:14Z","modified":"2026-10-28T02:30:26Z","fixes":[{"ecosystem":"Go","package":"github.com/junegunn/fzf","fixed_in":["0.73.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"fzf","fixed_in":["0.73.1-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/junegunn/fzf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.73.1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"fzf","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","0.74.4-1"]},{"source":"osv","ecosystem":"Debian:13","package":"fzf","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","0.74.4-1"]},{"source":"osv","ecosystem":"Debian:14","package":"fzf","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"]},{"source":"osv","ecosystem":"Go","package":"github.com/junegunn/fzf","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.73.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/junegunn/fzf","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.73.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"fzf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.0-2","0.18.0-3","0.19.0-1","0.20.0-1","0.20.0-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"fzf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.24.3-1","0.29.0-1","0.29.0-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"fzf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.42.0-1build1","0.44.1-1","0.44.1-1ubuntu0.1","0.44.1-1ubuntu0.2","0.44.1-1ubuntu0.3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"fzf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.60.3-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"fzf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.60.3-1","0.66.0-1","0.67.0-1"]}],"products":[{"vendor":"fzf","product":"fzf"},{"vendor":"junegunn","product":"fzf"}],"references":[{"url":"https://cert.pl/en/posts/2026/06/CVE-2026-53432","tags":["third-party-advisory","Third Party Advisory","advisory","web","report"]},{"url":"https://github.com/junegunn/fzf","tags":["product","Product","package","report"]},{"url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce","tags":["issue-tracking","Patch","report","web","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53433","tags":["advisory"]},{"url":"https://github.com/junegunn/fzf/releases/tag/v0.73.1","tags":["web"]},{"url":"https://github.com/advisories/GHSA-mvmf-94v6-879g","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53433.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-53433","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-53433","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53433","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-53433","title":"Denial of Service in fzf","description":"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.\n\nThis issue was fixed in version 0.73.1.","status":"published","published":"2026-06-30T12:01:14.407Z","modified":"2026-06-30T13:32:52.251Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:19:59.761005Z"}],"euvd":[{"id":"EUVD-2026-40303","description":"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.\n\nThis issue was fixed in version 0.73.1.","status":"published","published":"2026-06-30T12:01:14Z","modified":"2026-06-30T13:32:52Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:20:21.627235Z"}],"ghsa":[{"id":"GHSA-mvmf-94v6-879g","title":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation","description":"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.\n\nThis issue was fixed in version 0.73.1.","status":"published","published":"2026-06-30T15:30:44Z","modified":"2026-09-30T23:52:48Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:41:23.783773Z"}],"nvd":[{"id":"CVE-2026-53433","description":"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.\n\nThis issue was fixed in version 0.73.1.","status":"published","published":"2026-06-30T13:19:13.407Z","modified":"2026-07-02T19:01:45.227Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:12:26.508751Z"}],"osv":[{"id":"CVE-2026-53433","title":"Denial of Service in fzf","description":"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.\n\nThis issue was fixed in version 0.73.1.","status":"published","published":"2026-06-30T12:01:14.407Z","modified":"2026-10-28T02:30:26.6576955Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:45:07.787185Z"},{"id":"DEBIAN-CVE-2026-53433","description":"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.","status":"published","published":"2026-06-30T13:19:13.407Z","modified":"2026-10-01T03:03:18.963082606Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:57.236551Z"},{"id":"GHSA-mvmf-94v6-879g","title":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation","description":"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.\n\nThis issue was fixed in version 0.73.1.","status":"published","published":"2026-06-30T15:30:44Z","modified":"2026-10-01T20:56:21.610832605Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:46:52.170928Z"},{"id":"UBUNTU-CVE-2026-53433","description":"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.","status":"published","published":"2026-06-30T13:19:00Z","modified":"2026-07-03T21:45:30.861784041Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:41.382716Z"},{"id":"GO-2026-6620","title":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation in github.com/junegunn/fzf","description":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation in github.com/junegunn/fzf","status":"published","published":"2026-10-01T20:24:05Z","modified":"2026-10-01T20:45:15.887767103Z","updated_at":"2026-11-02T15:47:03.11707Z"}]}}