Vulnerability Details CVE-2026-5439
A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archives uploaded to certain endpoints and trusts metadata fields describing the uncompressed size of archived files. An attacker can craft a small ZIP archive containing a forged size value, causing the server to allocate extremely large buffers during extraction.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 15.3%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-5439
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cpe:2.3:a:orthanc-server:orthanc:0.1.0
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cpe:2.3:a:orthanc-server:orthanc:0.1.1
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cpe:2.3:a:orthanc-server:orthanc:0.2.0
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cpe:2.3:a:orthanc-server:orthanc:0.2.1
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cpe:2.3:a:orthanc-server:orthanc:0.2.2
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cpe:2.3:a:orthanc-server:orthanc:0.2.3
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cpe:2.3:a:orthanc-server:orthanc:0.3.0
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cpe:2.3:a:orthanc-server:orthanc:0.3.1
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cpe:2.3:a:orthanc-server:orthanc:0.4.0
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cpe:2.3:a:orthanc-server:orthanc:0.5.0
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cpe:2.3:a:orthanc-server:orthanc:0.5.1
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cpe:2.3:a:orthanc-server:orthanc:0.6.0
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cpe:2.3:a:orthanc-server:orthanc:0.6.1
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cpe:2.3:a:orthanc-server:orthanc:0.6.2
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cpe:2.3:a:orthanc-server:orthanc:0.7.0
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cpe:2.3:a:orthanc-server:orthanc:0.7.1
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cpe:2.3:a:orthanc-server:orthanc:0.7.2
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cpe:2.3:a:orthanc-server:orthanc:0.7.3
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cpe:2.3:a:orthanc-server:orthanc:0.7.4
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cpe:2.3:a:orthanc-server:orthanc:0.7.5
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cpe:2.3:a:orthanc-server:orthanc:0.7.6
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cpe:2.3:a:orthanc-server:orthanc:0.8.0
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cpe:2.3:a:orthanc-server:orthanc:0.8.1
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cpe:2.3:a:orthanc-server:orthanc:0.8.2
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cpe:2.3:a:orthanc-server:orthanc:0.8.3
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cpe:2.3:a:orthanc-server:orthanc:0.8.4
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cpe:2.3:a:orthanc-server:orthanc:0.8.5
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cpe:2.3:a:orthanc-server:orthanc:0.8.6
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cpe:2.3:a:orthanc-server:orthanc:0.9.0
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cpe:2.3:a:orthanc-server:orthanc:0.9.1
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cpe:2.3:a:orthanc-server:orthanc:0.9.2
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cpe:2.3:a:orthanc-server:orthanc:0.9.3
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cpe:2.3:a:orthanc-server:orthanc:0.9.4
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cpe:2.3:a:orthanc-server:orthanc:0.9.5
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cpe:2.3:a:orthanc-server:orthanc:0.9.6
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cpe:2.3:a:orthanc-server:orthanc:1.0.0
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cpe:2.3:a:orthanc-server:orthanc:1.1.0
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cpe:2.3:a:orthanc-server:orthanc:1.10.0
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cpe:2.3:a:orthanc-server:orthanc:1.10.1
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cpe:2.3:a:orthanc-server:orthanc:1.11.0
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cpe:2.3:a:orthanc-server:orthanc:1.11.1
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cpe:2.3:a:orthanc-server:orthanc:1.11.2
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cpe:2.3:a:orthanc-server:orthanc:1.11.3.
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cpe:2.3:a:orthanc-server:orthanc:1.12.0
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cpe:2.3:a:orthanc-server:orthanc:1.12.1
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cpe:2.3:a:orthanc-server:orthanc:1.12.10
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cpe:2.3:a:orthanc-server:orthanc:1.12.2
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cpe:2.3:a:orthanc-server:orthanc:1.12.3
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cpe:2.3:a:orthanc-server:orthanc:1.12.4
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cpe:2.3:a:orthanc-server:orthanc:1.12.5
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cpe:2.3:a:orthanc-server:orthanc:1.12.6
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cpe:2.3:a:orthanc-server:orthanc:1.12.7
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cpe:2.3:a:orthanc-server:orthanc:1.12.8
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cpe:2.3:a:orthanc-server:orthanc:1.12.9
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cpe:2.3:a:orthanc-server:orthanc:1.2.0
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cpe:2.3:a:orthanc-server:orthanc:1.3.1
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cpe:2.3:a:orthanc-server:orthanc:1.3.2
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cpe:2.3:a:orthanc-server:orthanc:1.4.1
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cpe:2.3:a:orthanc-server:orthanc:1.4.2
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cpe:2.3:a:orthanc-server:orthanc:1.5.0
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cpe:2.3:a:orthanc-server:orthanc:1.5.1
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cpe:2.3:a:orthanc-server:orthanc:1.5.2
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cpe:2.3:a:orthanc-server:orthanc:1.5.3
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cpe:2.3:a:orthanc-server:orthanc:1.5.4
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cpe:2.3:a:orthanc-server:orthanc:1.5.5
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cpe:2.3:a:orthanc-server:orthanc:1.5.6
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cpe:2.3:a:orthanc-server:orthanc:1.5.7
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cpe:2.3:a:orthanc-server:orthanc:1.5.8
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cpe:2.3:a:orthanc-server:orthanc:1.6.0
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cpe:2.3:a:orthanc-server:orthanc:1.6.1
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cpe:2.3:a:orthanc-server:orthanc:1.7.0
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cpe:2.3:a:orthanc-server:orthanc:1.7.1
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cpe:2.3:a:orthanc-server:orthanc:1.7.2
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cpe:2.3:a:orthanc-server:orthanc:1.7.3
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cpe:2.3:a:orthanc-server:orthanc:1.7.4
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cpe:2.3:a:orthanc-server:orthanc:1.8.0
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cpe:2.3:a:orthanc-server:orthanc:1.8.1
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cpe:2.3:a:orthanc-server:orthanc:1.8.2
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cpe:2.3:a:orthanc-server:orthanc:1.9.0
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cpe:2.3:a:orthanc-server:orthanc:1.9.1
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cpe:2.3:a:orthanc-server:orthanc:1.9.2
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cpe:2.3:a:orthanc-server:orthanc:1.9.3
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cpe:2.3:a:orthanc-server:orthanc:1.9.4
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cpe:2.3:a:orthanc-server:orthanc:1.9.5
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cpe:2.3:a:orthanc-server:orthanc:1.9.6
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cpe:2.3:a:orthanc-server:orthanc:1.9.7