CVE-2026-5440

A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.

Score

CVSS 3.1 7.5 High

Status

Analyzed - cret@cert.org

Published

2026-04-09

Last modified

2026-10-26

Weaknesses

CWE-770

Affected products

• Dicom Server (Orthanc)
• Orthanc (Orthanc-server)

References

• https://www.orthanc-server.com/
• https://www.machinespirits.de/
• https://kb.cert.org/vuls/id/536588