Description
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 | Fixed |
|---|---|---|---|
| Orthanc | DICOM Server | ≤ 1.12.10 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | orthanc | 1.12.10+dfsg-4 | — |
| Debian 13 | orthanc | No fix yet | — |
| Debian 12 | orthanc | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | orthanc | No fix yet | — |
| Ubuntu 26.04 LTS | orthanc | No fix yet | — |
| Ubuntu 25.10 | orthanc | No fix yet | — |
| Ubuntu 24.04 LTS | orthanc | No fix yet | — |
| Ubuntu 22.04 LTS | orthanc | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | orthanc | No fix yet | — |
| Ubuntu 18.04 LTS | orthanc | No fix yet | — |
| Ubuntu 16.04 LTS | orthanc | No fix yet | — |