CVE-2026-5440 (GCVE-0-2026-5440)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:43 – Updated: 2026-04-14 16:34
VLAI?
Title
Memory Exhaustion via Unbounded Content-Length
Summary
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.
Severity ?
7.5 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-5440",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-14T15:12:48.721931Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-14T16:34:31.991Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "DICOM Server",
"vendor": "Orthanc",
"versions": [
{
"lessThanOrEqual": "1.12.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"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."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-09T14:43:55.684Z",
"orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
"shortName": "certcc"
},
"references": [
{
"url": "https://www.orthanc-server.com/"
},
{
"url": "https://www.machinespirits.de/"
},
{
"url": "https://kb.cert.org/vuls/id/536588"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Memory Exhaustion via Unbounded Content-Length",
"x_generator": {
"engine": "VINCE 3.0.35",
"env": "prod",
"origin": "https://cveawg.mitre.org/api/cve/CVE-2026-5440"
}
}
},
"cveMetadata": {
"assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
"assignerShortName": "certcc",
"cveId": "CVE-2026-5440",
"datePublished": "2026-04-09T14:43:55.684Z",
"dateReserved": "2026-04-02T19:22:26.410Z",
"dateUpdated": "2026-04-14T16:34:31.991Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-5440",
"date": "2026-04-14",
"epss": "0.00023",
"percentile": "0.06095"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-5440\",\"sourceIdentifier\":\"cret@cert.org\",\"published\":\"2026-04-09T15:16:16.337\",\"lastModified\":\"2026-04-13T15:02:47.353\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://kb.cert.org/vuls/id/536588\",\"source\":\"cret@cert.org\"},{\"url\":\"https://www.machinespirits.de/\",\"source\":\"cret@cert.org\"},{\"url\":\"https://www.orthanc-server.com/\",\"source\":\"cret@cert.org\"}]}}"
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…