CVE-2026-53433
Denial of Service in fzf
- State
- Published
- Severity
- 5.7 Medium
- Published
- Jun 30, 2026
- Updated
- Jun 30, 2026
- Reserved
- Jun 9, 2026
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.
This issue was fixed in version 0.73.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.7 Medium | 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 | CERT-PL |
Weaknesses
- CWE-407 Inefficient Algorithmic Complexity
Affected Products
| Product | Versions |
|---|---|
fzffzf |
|
References
- https://cert.pl/en/posts/2026/06/CVE-2026-53432third-party-advisory
- https://github.com/junegunn/fzfproduct
- https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ceissue-tracking
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