Heap-based buffer overflow in Orthanc - CVE-2026-5444
Published: April 9, 2026
Vulnerability identifier: #VU125675
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-5444
CWE-ID: CWE-122
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 execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in the PAM image parsing logic when processing a crafted PAM image embedded in a DICOM file. A remote attacker can supply a crafted DICOM file containing a PAM image with chosen dimensions to execute arbitrary code.
The issue is triggered by integer overflow during buffer size calculation, causing a small allocation followed by a larger write operation during pixel processing.
How to mitigate CVE-2026-5444
Install security update from vendor's website.