---
cve: "CVE-2026-53433"
severity: "MEDIUM"
cvss: 5.7
epss: "21%"
vendor: "fzf"
kev: false
exploited: false
published: "2026-06-30 13:19:13"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T14:29:42+02:00"
---

# CVE-2026-53433

> 5.7 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- ce4bef75954bebd87e0886435bcf8c6904328ab0 (Commit)
- 7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce (Commit)

## Referenzen

- <https://cert.pl/en/posts/2026/06/CVE-2026-53432>
- <https://github.com/junegunn/fzf>
- <https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-53433) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_