CVE-2026-111924CWE-409

CVE-2026-111924

High · published October 17, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
28.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00359 · 28.4th percentile
Weakness
CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)
Published
2026-10-17T23:16Z
References (2)
https://github.com/fleetdm/fleet/security/advisories/GHSA-3982-g48v-9rwh · [email protected]https://www.vulncheck.com/advisories/fleet-before-4.83.0-denial-of-service-via-unbounded-gzip-decompression · [email protected]
EPSS history
Timeline
  • 19 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 17 OCT 18:46Z
    Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression
    cvelistv5
  • 17 OCT 18:46Z
    Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression
    cvelistv5