CVE-2026-53433: Junegunn Fzf

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Junegunn Fzf: before 0.73.1 (fixed in 0.73.1)

Published 2026-06-30. Last modified 2026-07-02.