Resource exhaustion in OpenEMR - #VU158849
Published: November 3, 2026
Vulnerability identifier: #VU158849
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/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 through memory exhaustion.
The vulnerability exists due to uncontrolled resource consumption in the PDF renderer's PHP stream-filter processing when resolving user-controlled resources during PDF generation. A remote user can submit document content that causes an excessive php://filter chain to be processed to exhaust memory and cause a denial of service.
Affected software
OpenEMR
Remediation
Install security update from vendor's website.
OpenEMR - update to 8.5.0