orthanc: A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`
CVE-2026-5438 is fixed in orthanc on 1 platform by DEBIAN-CVE-2026-5438 (version 1.12.10+dfsg-4), released April 9, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| orthanc · Debian 14 | 1.12.10+dfsg-4 | DEBIAN-CVE-2026-5438 | Apr 9, 2026 |
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