CVE-2026-53433
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductJunegunn Fzf
PublishedJun 30, 2026
First seenJun 30, 2026
Weakness typeCWE-407CWE-407
How to fix
Update
- junegunn fzf0.73.1 or later
- github.com/junegunn/fzf0.73.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| junegunn fzf | v < 0.73.1 | 0.73.1 |
| github.com/junegunn/fzfGo | v < 0.73.1 | 0.73.1 |
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