# CVE-2026-53433: fzf: fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to in...

CVE-2026-53433 is fixed in fzf on 1 platform by DEBIAN-CVE-2026-53433 (version 0.73.1-1), released July 1, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-53433
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0038
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 30, 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fzf Debian 14 | 0.73.1-1 | [DEBIAN-CVE-2026-53433](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53433.md) | Jul 1, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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