---
id: CVE-2026-115319
title: fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
summary: >-
  fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity
  vulnerability in maskActionContents that allows local attackers to exhaust the
  --listen HTTP server through quadratic string concatenation. Attackers can
  repeatedly…
severity: low
cvss: 2.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-407
vendor: junegunn
product: fzf
affected:
  - fzf >= 0.36.0 <= 0.74.5
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T10:57:40.288Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115319'
references:
  - url: >-
      https://github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6
    label: Patch Commit
  - url: 'https://github.com/junegunn/fzf/blob/v0.74.5/src/options.go#L1680-L1736'
  - url: 'https://github.com/junegunn/fzf'
  - url: >-
      https://www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents
    label: >-
      VulnCheck Advisory: fzf 0.36.0 through 0.74.5 Denial of Service via
      maskActionContents
tags:
  - cve.org
ingestedAt: '2026-10-22T11:37:02.337Z'
---

## Overview

fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time.

## Affected

- `fzf >= 0.36.0 <= 0.74.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.