CVE-2026-53433Medium▾ Sunlitfzf vulnerable to denial of service through quadratic HTTP request-body accumulation
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27.5 · likelihood 0.1 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
Last analysed / modified upstream
0.4%
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.
github.com/junegunn/fzf < 0.73.1Upgrade to a patched release:
github.com/junegunn/fzf 0.73.1Connected by shared product, vendor, weakness, or advisory.
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