← Vulnerability feed

Vulnerability record · CVE-2026-5441 · published 9 April 2026

CVE-2026-5441: Orthanc-server orthanc out-of-bounds read vulnerability

Orthanc Server · Orthanc

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.

7.1 CVSS 3.1 High EPSS 0.19% · top 92.3% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.cert.org/vuls/id/536588 Third Party AdvisoryVDB Entry
https://www.machinespirits.de/ Not Applicable
https://www.orthanc-server.com/ Product

Track CVE-2026-5441 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-5442Orthanc-server orthanc out-of-bounds write vulnerabilityA heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (U…EPSS 0.92%9.8CVE-2026-5443Orthanc-server orthanc out-of-bounds write vulnerabilityA heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length validation uses 32-bit multiplication f…EPSS 0.88%9.2CVE-2025-0896Orthanc-server orthanc missing authentication for critical function vulnerabilityOrthanc server prior to version 1.5.8 does not enable basic authentication by default when remote access is enabled. This could result in unauthorize…EPSS 2.5%9.1CVE-2026-5445Orthanc-server orthanc out-of-bounds read vulnerabilityAn out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used f…EPSS 0.79%8.8CVE-2023-33466Orthanc-server orthanc code injection vulnerabilityOrthanc before 1.12.0 allows authenticated users with access to the Orthanc API to overwrite arbitrary files on the file system, and in specific depl…EPSS 4.2%7.5CVE-2026-5440Orthanc-server orthanc allocation without limits vulnerabilityA memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly…EPSS 0.94%7.5CVE-2026-5437Orthanc-server orthanc out-of-bounds read vulnerabilityAn out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing malformed metadata structures, th…EPSS 0.76%7.5CVE-2026-5438Orthanc-server orthanc allocation without limits vulnerabilityA gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits …EPSS 0.76%

Source: NIST National Vulnerability Database (record CVE-2026-5441), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.