Medium 5.7Published Jun 30, 2026

CVE-2026-53433Denial of Service in fzf

Updated under an hour ago (Oct 27, 2026, 12:20 PM ET)

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It affects fzf and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for fzf

Exploited in the last 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.

CVSS: 5.7 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: CERT-PL
NVD analysis: Analyzed
Record last updated: Jun 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

fzf fzf fzf:fzf (from the name)	before 0.73.1	CNA record
junegunn fzf junegunn:fzf	before 0.73.1	NVD

References

References

https://cert.pl/en/posts/2026/06/CVE-2026-53432	third-party-advisory
https://github.com/junegunn/fzf	product
https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce	issue-tracking, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.