CVE-2026-53433

highCVSS 7.5covered by 1 sourcefirst seen 2026-06-30

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.

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Exploitation outlook

Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-53433: fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the …nvd · 2026-06-30

External references

NVD record for CVE-2026-53433

CVE.org record

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