High 7.5Published Oct 17, 2026

CVE-2026-111924Fleet before 4.83.0 Denial of Service via Unbounded Gzip Decompression

Updated under an hour ago (Oct 28, 2026, 8:00 AM ET)

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It affects fleetdm fleet. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.36%, higher than 29% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-409
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.36% (percentile 29)
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 17, 2026

Affected products

Affected products

fleetdm fleet fleetdm:fleet (from the name)	before 4.83.0; 4.83.0 not affected	CNA record

References

References

https://github.com/fleetdm/fleet/security/advisories/GHSA-3982-g48v-9rwh	vendor-advisory
https://www.vulncheck.com/advisories/fleet-before-4.83.0-denial-of-service-via-unbounded-gzip-decompression	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.