Allocation of Resources Without Limits or Throttling in Orthanc - CVE-2026-5440
Published: April 9, 2026
Vulnerability identifier: #VU125671
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5440
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Orthanc
Affected software:
Orthanc
Orthanc
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource management in the HTTP server when handling requests with an attacker-supplied Content-Length header. A remote attacker can send a crafted HTTP request with an extremely large Content-Length value to cause a denial of service.
The issue can be triggered without sending a request body.
How to mitigate CVE-2026-5440
Install security update from vendor's website.