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Advisory record · GHSA-mvmf-94v6-879g

fzf vulnerable to denial of service through quadratic HTTP request-body accumulation

CVSS 5.7 MediumEPSS 0.0038 · 32nd percentile

Published by the GitHub Advisory Database at 30 Jun 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/junegunn/fzfGo<0.73.10.73.1
Identifiers
GHSA-mvmf-94v6-879g · CVE-2026-53433 · GO-2026-6620
Weakness (CWE)
CWE-407
Tags
Published
30 Jun 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

fzf versions before 0.73.1 are vulnerable to denial of service when run with --listen mode. The HTTP body handling uses repeated string concatenation, so a crafted POST request made of many small segments can consume excessive CPU and block other clients. Users should upgrade to fzf 0.73.1 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.7 Medium 4.0 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 CNA (CERT-PL)
  • CISA KEV Not listed.
  • EPSS 0.0038, the 32nd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.