# CVE-2026-5440: A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The…

Source: https://junglewise.ai/threats/cve-2026-5440-a-memory-exhaustion-vulnerability-exists-in-the-http-server-due-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-09  
License: CC BY 4.0 with a link back

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.

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-2026-5440 exploited in the wild?** 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.

## Affected products

- Orthanc-Server Orthanc

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