---
id: CVE-2026-111924
title: Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression
summary: >-
  Fleet before 4.83.0 contains a denial of service vulnerability that allows
  unauthenticated attackers to exhaust server memory by sending gzip-compressed
  request bodies. Attackers can send small, highly compressed requests with
  Content-En…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-409
vendor: fleetdm
product: fleet
affected:
  - fleet < 4.83.0
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T18:46:37.369Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111924'
references:
  - url: 'https://github.com/fleetdm/fleet/security/advisories/GHSA-3982-g48v-9rwh'
    label: GitHub Security Advisory (GHSA-3982-g48v-9rwh)
  - url: >-
      https://www.vulncheck.com/advisories/fleet-before-4.83.0-denial-of-service-via-unbounded-gzip-decompression
    label: >-
      VulnCheck Advisory: Fleet before 4.83.0 Denial of Service via Unbounded
      Gzip Decompression
tags:
  - cve.org
ingestedAt: '2026-10-17T19:08:56.591Z'
---

## Overview

Fleet before 4.83.0 contains a denial of service vulnerability that allows unauthenticated attackers to exhaust server memory by sending gzip-compressed request bodies. Attackers can send small, highly compressed requests with Content-Encoding: gzip to unauthenticated endpoints that expand during decoding, crashing the entire Fleet instance.

## Affected

- `fleet < 4.83.0`

## Remediation

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