CVE-2026-5440 Details
Description
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.
A memory exhaustion vulnerability has been identified in Orthanc DICOM Server versions through 1.12.10. The issue arises in the HTTP server, which allocates memory based on the 'Content-Length' header value provided by the attacker, without enforcing any upper limit. This unbounded allocation can lead to excessive memory use and server termination, even if no request body is sent. The vulnerability stems from unsafe handling of HTTP headers, allowing for crafted requests that exploit this weakness.
Users are advised to upgrade to Orthanc version 1.12.11, which addresses this vulnerability. After upgrading, administrators should review deployment configurations to limit exposure of upload and image processing functionality to trusted users and networks.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://kb.cert.org/vuls/id/536588 | [email protected] | Third Party AdvisoryVDB Entry |
| https://www.machinespirits.de/ | [email protected] | Not Applicable |
| https://www.orthanc-server.com/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| orthanc-server orthanc | < 1.12.11 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 14, 2026 | Initial Analysis | [email protected] |
| Apr 14, 2026 | CVE Modified | CISA-ADP |
| Apr 9, 2026 | New CVE Received | [email protected] |