{"id":"CVE-2026-53433","aliases":["GHSA-mvmf-94v6-879g"],"title":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation","summary":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation","severity":"medium","cwe":["CWE-407"],"vendor":"junegunn","product":"github.com/junegunn/fzf","ecosystem":"go","affected":["github.com/junegunn/fzf < 0.73.1"],"patched":["github.com/junegunn/fzf 0.73.1"],"published":"2026-06-30","updated":"2026-09-30","sourceUpdated":"2026-09-30T23:52:48Z","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-mvmf-94v6-879g","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53433"},{"url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"},{"url":"https://cert.pl/en/posts/2026/06/CVE-2026-53432"},{"url":"https://github.com/junegunn/fzf"},{"url":"https://github.com/junegunn/fzf/releases/tag/v0.73.1"},{"url":"https://github.com/advisories/GHSA-mvmf-94v6-879g"}],"tags":["ghsa","go"],"epss":0.00378,"epssPercentile":0.2922,"ingestedAt":"2026-10-01T00:33:27.737Z","slug":"CVE-2026-53433","body":"## Overview\n\nfzf 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.\n\n## Affected packages\n\n- `github.com/junegunn/fzf < 0.73.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/junegunn/fzf 0.73.1`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}