{"id":"CVE-2026-53433","aliases":["GHSA-mvmf-94v6-879g","GO-2026-6620"],"url":"https://o3.security/vulnerability/CVE-2026-53433","summary":"Denial of Service in fzf","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.","published":"2026-06-30T12:01:14.407Z","modified":"2026-10-21T02:30:55.669400327Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/junegunn/fzf","fixedVersion":"0.73.1"}],"fix":{"url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce","label":"junegunn/fzf@7963a2c"},"references":[{"type":"ADVISORY","url":"https://cert.pl/en/posts/2026/06/CVE-2026-53432"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53433.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53433"},{"type":"REPORT","url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"},{"type":"PACKAGE","url":"https://github.com/junegunn/fzf"},{"type":"WEB","url":"https://github.com/junegunn/fzf/releases/tag/v0.73.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:30:55.669400327Z"}}