CVE-2026-5438Gzip Decompression Bomb via Content-Encoding Header
Updated under an hour ago ()
Does this affect you?
It affects Orthanc DICOM Server and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.76%, higher than 54% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.76% (percentile 54)
- Assigned by
- certcc
- NVD analysis
- Analyzed
- Record last updated
- Apr 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Orthanc DICOM Server orthanc:dicom_server (from the name) | through 1.12.10 | CNA record |
orthanc-server orthanc orthanc-server:orthanc | before 1.12.11 | NVD |
References
- https://www.orthanc-server.com/product
- https://www.machinespirits.de/not-applicable
- https://kb.cert.org/vuls/id/536588third-party-advisory, vdb-entry
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.