CVE-2026-5440

Memory Exhaustion via Unbounded Content-Length

Published Apr 9, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-400
CWE-789
Type Values Removed Values Added
First Time appeared Orthanc-server
Orthanc-server orthanc
Weaknesses CWE-770
CPEs cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*
Vendors & Products Orthanc-server
Orthanc-server orthanc
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-400
CWE-789
Type Values Removed Values Added
First Time appeared Orthanc
Orthanc dicom Server
Vendors & Products Orthanc
Orthanc dicom Server
Type Values Removed Values Added
Description A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.
Title Memory Exhaustion via Unbounded Content-Length
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Apr 14, 2026, 4:34 PM
Reserved
Apr 2, 2026, 7:22 PM
Status
Analyzed
Published
Apr 9, 2026, 3:16 PM
Modified
Oct 26, 2026, 9:10 PM