FKIE_CVE-2026-42946
Vulnerability from fkie_nvd - Published: 2026-05-13 16:16 - Updated: 2026-06-18 14:12
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
References
| URL | Tags | ||
|---|---|---|---|
| f5sirt@f5.com | https://my.f5.com/manage/s/article/K000161027 | Mitigation, Vendor Advisory |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| f5 | dos | * | |
| f5 | dos | 4.8.0 | |
| f5 | nginx_gateway_fabric | * | |
| f5 | nginx_gateway_fabric | * | |
| f5 | nginx_ingress_controller | * | |
| f5 | nginx_ingress_controller | * | |
| f5 | nginx_ingress_controller | * | |
| f5 | nginx_instance_manager | * | |
| f5 | nginx_open_source | * | |
| f5 | nginx_open_source | * | |
| f5 | nginx_plus | * | |
| f5 | waf | * | |
| f5 | waf | * | |
| f5 | waf | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"modules": [
"ngx_http_scgi_module and ngx_http_uwsgi_module"
],
"product": "NGINX Plus",
"vendor": "F5",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "R37",
"versionType": "custom"
},
{
"lessThan": "R36 P4",
"status": "affected",
"version": "R36",
"versionType": "custom"
},
{
"lessThan": "R32 P6",
"status": "affected",
"version": "R32",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"modules": [
"ngx_http_scgi_module and ngx_http_uwsgi_module"
],
"product": "NGINX Open Source",
"vendor": "F5",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1.31.0",
"versionType": "semver"
},
{
"lessThan": "1.30.1",
"status": "affected",
"version": "0.8.42",
"versionType": "semver"
}
]
}
],
"source": "f5sirt@f5.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*",
"matchCriteriaId": "0772572C-26F9-4FA4-B9E6-BA40ED59F569",
"versionEndIncluding": "4.7.0",
"versionStartIncluding": "4.3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*",
"matchCriteriaId": "C45452BD-7A86-48E7-8E1D-1B340FF70B3B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*",
"matchCriteriaId": "15B7F1FD-0C49-460F-9CB8-23DA730EC4BE",
"versionEndIncluding": "1.6.2",
"versionStartIncluding": "1.3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*",
"matchCriteriaId": "0A6AA23F-A7A1-43DE-AD67-0EB1249143A4",
"versionEndIncluding": "2.6.0",
"versionStartIncluding": "2.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*",
"matchCriteriaId": "10D5B143-4C1E-4626-8B49-3EA7160E9256",
"versionEndIncluding": "3.7.2",
"versionStartIncluding": "3.5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*",
"matchCriteriaId": "73A1CDBB-49F6-4AB6-AA67-542FD8017D6A",
"versionEndIncluding": "4.0.1",
"versionStartIncluding": "4.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*",
"matchCriteriaId": "607EEFA3-BE2A-4660-8C67-E6FC9799325F",
"versionEndIncluding": "5.4.2",
"versionStartIncluding": "5.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CBC31553-99DE-4155-A8E5-13A84FCCB610",
"versionEndIncluding": "2.22.0",
"versionStartIncluding": "2.16.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C28A19F7-DD00-4D55-982F-15C15A9C0128",
"versionEndIncluding": "0.9.7",
"versionStartIncluding": "0.8.42",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BC94D0FA-F4AE-4178-AE9A-8CB645E3DF7C",
"versionEndIncluding": "1.30.0",
"versionStartIncluding": "1.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*",
"matchCriteriaId": "0B153576-468F-48C2-9BC8-922A938AB235",
"versionEndIncluding": "r36",
"versionStartIncluding": "r32",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*",
"matchCriteriaId": "F365BA5A-42D7-4024-9143-06D4DEE31212",
"versionEndIncluding": "4.16.0",
"versionStartIncluding": "4.9.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*",
"matchCriteriaId": "8D720985-9119-480E-929A-7D9D5C083628",
"versionEndIncluding": "5.8.0",
"versionStartIncluding": "5.1.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*",
"matchCriteriaId": "DE69C522-7FCB-4452-8E33-FCC72D36BF94",
"versionEndIncluding": "5.12.1",
"versionStartIncluding": "5.9.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability exists in the ngx_http_scgi_module\u00a0and ngx_http_uwsgi_module\u00a0modules that may result in excessive memory allocation or an over-read of data. When scgi_pass\u00a0or uwsgi_pass\u00a0is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.\u00a0 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
}
],
"id": "CVE-2026-42946",
"lastModified": "2026-06-18T14:12:00.637",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 4.2,
"source": "f5sirt@f5.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 5.2,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "f5sirt@f5.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-42946",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T15:55:04.864917Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-13T16:16:50.340",
"references": [
{
"source": "f5sirt@f5.com",
"tags": [
"Mitigation",
"Vendor Advisory"
],
"url": "https://my.f5.com/manage/s/article/K000161027"
}
],
"sourceIdentifier": "f5sirt@f5.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-789"
},
{
"lang": "en",
"value": "CWE-823"
}
],
"source": "f5sirt@f5.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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