CVE-2026-5440: A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The…
CVE-2026-5440 · Severity: high · CVSS 7.5 · Published 2026-04-09
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-5440 being exploited in the wild.
How severe is CVE-2026-5440?
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-2026-5440?
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-2026-5440?
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.