Out-of-bounds Read in Orthanc Dicom Server
CVE-2026-5441
An out-of-bounds read vulnerability exists in the `DecodePsmctRle1` function of `DicomImageDecoder.cpp`. The `PMSCT_RLE1` decompression routine, which decodes the proprietary Philips Compression format, does not properly validate escape markers placed near the end of the compressed data stream. A crafted sequence at the end of the buffer can cause the decoder to read beyond the allocated memory region and leak heap data into the rendered image output.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.001 (3.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.001 · change: -0.001
Affected products
- Orthanc Dicom Server — versions 0
- Orthanc-Server Orthanc
Weakness classification (CWE)
References
- www.orthanc-server.com/ (Product)
- www.machinespirits.de/ (Not Applicable)
- kb.cert.org/vuls/id/536588 (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-5441?
- CVE-2026-5441 is a high-severity vulnerability in Orthanc Dicom Server, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-04-09.
- How severe is CVE-2026-5441?
- High severity. CVSS v3 base score is 7.1 out of 10.