Resource exhaustion in Orthanc - CVE-2026-5438
Published: April 9, 2026
Vulnerability identifier: #VU125669
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-2026-5438
CWE-ID: CWE-400
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 HTTP request handling when processing an HTTP request with Content-Encoding: gzip. A remote attacker can send a specially crafted gzip payload to cause a denial of service.
How to mitigate CVE-2026-5438
Install security update from vendor's website.