CVE-2026-5440

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://kb.cert.org/vuls/id/536588	Third Party Advisory VDB Entry
https://www.machinespirits.de/	Not Applicable
https://www.orthanc-server.com/	Product

Configurations

Configuration 1 (hide)

cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-09 15:16

Updated : 2026-06-17 10:59

NVD link : CVE-2026-5440

Mitre link : CVE-2026-5440

CVE.ORG link : CVE-2026-5440

JSON object : View

Products Affected

orthanc-server

orthanc

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2026-5440", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5440", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-14T15:12:48.721931Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "cret@cert.org", "affectedData": [{"vendor": "Orthanc", "product": "DICOM Server", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "1.12.10"}]}]}], "published": "2026-04-09T15:16:16.337", "references": [{"url": "https://kb.cert.org/vuls/id/536588", "tags": ["Third Party Advisory", "VDB Entry"], "source": "cret@cert.org"}, {"url": "https://www.machinespirits.de/", "tags": ["Not Applicable"], "source": "cret@cert.org"}, {"url": "https://www.orthanc-server.com/", "tags": ["Product"], "source": "cret@cert.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-06-17T10:59:01.787", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A259075D-8B77-4B04-BC42-3E5ABE9DFE1F", "versionEndExcluding": "1.12.11"}], "operator": "OR"}]}], "sourceIdentifier": "cret@cert.org"}