Out-of-bounds Read in Orthanc Dicom Server
CVE-2026-5437
An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing malformed metadata structures, the parser may read beyond the bounds of the allocated metadata buffer. Although this issue does not typically crash the server or expose data directly to the attacker, it reflects insufficient input validation in the parsing logic.
Vulnerability class: Buffer Overflow
EPSS: 0.006 (48.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Orthanc Dicom Server — versions 0
- Orthanc-server Orthanc
Weakness classification (CWE)
References
- cret@cert.org (Product)
- cret@cert.org (Not Applicable)
- cret@cert.org (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-5437?
- CVE-2026-5437 is a high-severity vulnerability in Orthanc Dicom Server, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-04-09.
- How severe is CVE-2026-5437?
- High severity. CVSS v3 base score is 7.5 out of 10.