{"id":"GHSA-mvmf-94v6-879g","summary":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation","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.\n\nThis issue was fixed in version 0.73.1.","aliases":["CVE-2026-53433","GO-2026-6620"],"modified":"2026-10-01T20:56:21.610832605Z","published":"2026-06-30T15:30:44Z","database_specific":{"github_reviewed_at":"2026-09-30T23:52:48Z","nvd_published_at":"2026-06-30T13:19:13Z","cwe_ids":["CWE-407"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53433"},{"type":"WEB","url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"},{"type":"WEB","url":"https://cert.pl/en/posts/2026/06/CVE-2026-53432"},{"type":"PACKAGE","url":"https://github.com/junegunn/fzf"},{"type":"WEB","url":"https://github.com/junegunn/fzf/releases/tag/v0.73.1"}],"affected":[{"package":{"name":"github.com/junegunn/fzf","ecosystem":"Go","purl":"pkg:golang/github.com/junegunn/fzf"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.73.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mvmf-94v6-879g/GHSA-mvmf-94v6-879g.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}