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High severity · published Jul 1, 2026
CVE-2026-56150
Allocation of Resources Without Limits or Throttling in Fleet Server Leading to Denial of Service
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
Allocation of Resources Without Limits or Throttling (CWE-770) in Fleet Server can lead to a denial of service via Excessive Allocation (CAPEC-130). An attacker can submit a specially crafted request to an upload endpoint that causes excessive memory consumption, which may render Fleet Server unavailable.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FS
Fleet Server · Elastic
9.0.0 through 9.2.4; 8.0.0 through 8.19.10 · source: vendor, NVD
Affected product
FS
Fleet Server
Elastic
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56150
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56150
Vendor Advisory
https://discuss.elastic.co/t/fleet-server-8-19-11-9-2-5-9-3-0-security-update-esa-2026-44
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