Vulnerabilities in pkg:golang/github.com/junegunn/fzf

PACKAGE
Advisory Identifier: GHSA-mvmf-94v6-879g
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Advisory Summary

CVE-2026-53433 is a MODERATE denial of service vulnerability (CWE-407: Inefficient Algorithmic Complexity) affecting Github.com/junegunn/fzf libraries in the Go ecosystem. The issue involves fzf vulnerable to denial of service through quadratic http request-body accumulation. Remediation is available by upgrading affected packages to version 0.73.1.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/junegunn/fzf

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/junegunn/fzf. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-mvmf-94v6-879g CVE-2026-53433 MODERATE fzf vulnerable to denial of service through quadratic HTTP request-body accumulation

CVE-2026-53433 at a Glance

CVE Identifier CVE-2026-53433
GHSA Identifier GHSA-mvmf-94v6-879g
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-407: Inefficient Algorithmic Complexity
Affected Product Github.com/junegunn/fzf
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2026-53433

To remediate this vulnerability, upgrade all affected Github.com/junegunn/fzf dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/junegunn/fzf fixed: 0.73.1 
Upgrade github.com/junegunn/fzf to 0.73.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/junegunn/fzf

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-53433, inspect your project dependencies for Github.com/junegunn/fzf:

inspect dependencies for github.com/junegunn/fzf

Analyze the terminal output to locate any version of Github.com/junegunn/fzf in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.73.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-407: Inefficient Algorithmic Complexity, where an algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. In Github.com/junegunn/fzf, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-53433 Affected Github.com/junegunn/fzf Versions

1 component(s)
Fixed Versions:
0.73.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/junegunn/fzf
golang/github.com/junegunn/fzf
Go
< 0.73.1
0.73.1

References

NVD — CVE-2026-53433 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53433
Security Fix Commit FIX COMMIT
https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce
cert.pl/en/posts/2026/06/cv... WEB
https://cert.pl/en/posts/2026/06/CVE-2026-53432
Github.com/junegunn/fzf Source Repository REPOSITORY
https://github.com/junegunn/fzf
Github.com/junegunn/fzf Release RELEASE
https://github.com/junegunn/fzf/releases/tag/v0.73.1

Frequently Asked Questions

What is CVE-2026-53433?
CVE-2026-53433 is a security vulnerability in Github.com/junegunn/fzf involving fzf vulnerable to denial of service through quadratic HTTP request-body accumulation under CWE-407: Inefficient Algorithmic Complexity.
Which Github.com/junegunn/fzf versions are affected?
Affected versions include releases prior to 0.73.1 across affected packages: github.com/junegunn/fzf.
What version fixes CVE-2026-53433?
Upgrading to 0.73.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/junegunn/fzf affected?
Yes, github.com/junegunn/fzf is affected in releases prior to 0.73.1. Upgrade your dependency to 0.73.1 or later.
What CWE is associated with CVE-2026-53433?
CVE-2026-53433 is classified under CWE-407: Inefficient Algorithmic Complexity (An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.).
How can I check Go dependencies for CVE-2026-53433?
Run the dependency tree command: 'inspect dependencies for github.com/junegunn/fzf'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mvmf-94v6-879g",
  "modified" : "2026-09-30T23:52:48Z",
  "published" : "2026-06-30T15:30:44Z",
  "aliases" : [ "CVE-2026-53433" ],
  "summary" : "fzf vulnerable to denial of service through quadratic HTTP request-body accumulation",
  "details" : "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.\n\nThis issue was fixed in version 0.73.1.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/junegunn/fzf"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.73.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53433"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/en/posts/2026/06/CVE-2026-53432"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/junegunn/fzf"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/junegunn/fzf/releases/tag/v0.73.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-407" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-30T23:52:48Z",
    "nvd_published_at" : "2026-06-30T13:19:13Z"
  }
}