high7.5
CVE-2026-5438
A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`.
Impact
A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Orthanc-Server | Orthanc | before 1.12.11 |