CVE-2026-5440
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductOrthanc
PublishedApr 9, 2026
First seenApr 9, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- orthanc-server orthanc1.12.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| orthanc-server orthanc | v < 1.12.11 | 1.12.11 |
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