CVE-2026-5439
Memory Exhaustion in Orthanc ZIP Processing via Forged Metadata
Publication date: 2026-04-09
Last updated on: 2026-04-15
Assigner: CERT/CC
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| orthanc-server | orthanc | to 1.12.11 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a memory exhaustion issue in the processing of ZIP archives by Orthanc. When Orthanc automatically extracts ZIP archives uploaded to certain endpoints, it relies on metadata fields that describe the uncompressed size of the files inside the archive. An attacker can create a small ZIP archive with a forged size value that is much larger than the actual content, causing the server to allocate very large buffers during extraction.
How can this vulnerability impact me? :
The impact of this vulnerability is that an attacker can cause the server to allocate excessive memory resources by submitting a crafted ZIP archive. This can lead to memory exhaustion, potentially causing the server to slow down, crash, or become unresponsive, resulting in a denial of service.