Resource exhaustion in OpenEMR - #VU158838
Published: November 3, 2026
Vulnerability identifier: #VU158838
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service by exhausting PHP worker resources.
The vulnerability exists due to uncontrolled resource consumption in OpenEMR's lab-label PDF generation endpoint, interface/procedure_tools/libs/labs_ajax.php, when processing print_labels requests without an upper bound on the count parameter. A remote user can submit an excessive count to trigger repeated PDF page and barcode generation, consuming worker memory and CPU until resource or execution-time limits are reached; concurrent requests can exhaust the worker pool and disrupt other OpenEMR requests.
Affected software
OpenEMR
Remediation
Install security update from vendor's website.
OpenEMR - update to 8.5.0