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High severity · published Aug 21, 2026
CVE-2026-59654
Apache CloudStack: DoS caused by database connections leak
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
Missing Release of Resource after Effective Lifetime vulnerability in Apache CloudStack's scoped global configuration functionality. It affects different modules and plugins of the CloudStack management server, including Quota, Host-HA, etc., and may lead to eventual denial of service (DoS) scenario for the management server. This issue affects Apache CloudStack: from 4.7.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.
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)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CloudStack · Apache Software Foundation
4.7.0 through 4.20.3.0; 4.21.0.0 through 4.22.1.0 · source: vendor
CL
Cloudstack · Apache
4.7.0 before 4.20.3.1; 4.21.0.0 before 4.22.1.1 · source: NVD
Affected product
AC
Apache CloudStack
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59654
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59654
Vendor Advisory
https://lists.apache.org/thread/7cgf37clcpjj4g2hl7rnyoq1th3ht9r4
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