# CVE-2026-5437: An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing…

Source: https://junglewise.ai/threats/cve-2026-5437-an-out-of-bounds-read-vulnerability-exists-in-dicomstreamreader  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-09  
License: CC BY 4.0 with a link back

CVE-2026-5437 · Severity: high · CVSS 7.5 · Published 2026-04-09

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.

Technologies: [Orthanc-Server Orthanc](https://junglewise.ai/threats/technologies/orthanc-server-orthanc). Vendors: [Orthanc-Server](https://junglewise.ai/threats/vendors/orthanc-server).

## Quick answers

**Is CVE-2026-5437 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5437 being exploited in the wild.

**How severe is CVE-2026-5437?** High severity, with a CVSS score of 7.5, published 9 April 2026.

**Which products and versions are affected?** Orthanc-Server Orthanc. The advisory does not name versions.

**Is there a fix for CVE-2026-5437?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-5437?** Check whether you run Orthanc-Server Orthanc. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Orthanc-Server Orthanc

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