{"cve":"CVE-2026-53433","nvd":{"published":"2026-06-30T13:19:13.407","modified":"2026-07-02T19:01:45.227","status":"Analyzed","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.","cvss_v4":{"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","score":5.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-407"],"references":["https://cert.pl/en/posts/2026/06/CVE-2026-53432","https://github.com/junegunn/fzf","https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"],"products":["junegunn:fzf"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-53433","score":0.00378,"percentile":0.31813,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mvmf-94v6-879g","url":"https://osv.dev/vulnerability/GHSA-mvmf-94v6-879g","summary":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation","modified":"2026-10-01T20:56:21.610832605Z","packages":[{"ecosystem":"Go","name":"github.com/junegunn/fzf","purl":"pkg:golang/github.com/junegunn/fzf","ranges":["<0.73.1"],"fixed":["0.73.1"]}]},{"id":"GO-2026-6620","url":"https://osv.dev/vulnerability/GO-2026-6620","summary":"fzf vulnerable to denial of service through quadratic HTTP request-body accumulation in github.com/junegunn/fzf","modified":"2026-10-01T20:45:15.887767103Z","packages":[{"ecosystem":"Go","name":"github.com/junegunn/fzf","purl":"pkg:golang/github.com/junegunn/fzf","ranges":["<0.73.1"],"fixed":["0.73.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}