---
id: CVE-2026-53433
aliases:
  - GHSA-mvmf-94v6-879g
title: >-
  fzf vulnerable to denial of service through quadratic HTTP request-body
  accumulation
summary: >-
  fzf vulnerable to denial of service through quadratic HTTP request-body
  accumulation
severity: medium
cwe:
  - CWE-407
vendor: junegunn
product: github.com/junegunn/fzf
ecosystem: go
affected:
  - github.com/junegunn/fzf < 0.73.1
patched:
  - github.com/junegunn/fzf 0.73.1
published: '2026-06-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T23:52:48Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-mvmf-94v6-879g'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53433'
  - url: >-
      https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce
  - url: 'https://cert.pl/en/posts/2026/06/CVE-2026-53432'
  - url: 'https://github.com/junegunn/fzf'
  - url: 'https://github.com/junegunn/fzf/releases/tag/v0.73.1'
  - url: 'https://github.com/advisories/GHSA-mvmf-94v6-879g'
tags:
  - ghsa
  - go
epss: 0.00378
epssPercentile: 0.2922
ingestedAt: '2026-10-01T00:33:27.737Z'
---

## Overview

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.

## Affected packages

- `github.com/junegunn/fzf < 0.73.1`

## Remediation

Upgrade to a patched release:

- `github.com/junegunn/fzf 0.73.1`