FKIE_CVE-2026-27651
Vulnerability from fkie_nvd - Published: 2026-03-24 15:16 - Updated: 2026-07-15 02:19
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/
Summary
When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| f5 | nginx_open_source | * | |
| f5 | nginx_open_source | * | |
| f5 | nginx_open_source | * | |
| f5 | nginx_plus | * | |
| f5 | nginx_plus | r32 | |
| f5 | nginx_plus | r32 | |
| f5 | nginx_plus | r32 | |
| f5 | nginx_plus | r32 | |
| f5 | nginx_plus | r32 | |
| f5 | nginx_plus | r35 | |
| f5 | nginx_plus | r35 | |
| f5 | nginx_plus | r36 | |
| f5 | nginx_plus | r36 | |
| f5 | nginx_plus | r36 |
{
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{
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{
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"modules": [
"ngx_mail_auth_http_module"
],
"product": "NGINX Open Source",
"vendor": "F5",
"versions": [
{
"lessThan": "1.29.7",
"status": "affected",
"version": "1.29.0",
"versionType": "semver"
},
{
"lessThan": "1.28.3",
"status": "affected",
"version": "0.5.15",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"modules": [
"ngx_mail_auth_http_module"
],
"product": "NGINX Plus",
"vendor": "F5",
"versions": [
{
"lessThan": "R36 P3",
"status": "affected",
"version": "R36",
"versionType": "custom"
},
{
"lessThan": "R35 P2",
"status": "affected",
"version": "R35",
"versionType": "custom"
},
{
"lessThan": "*",
"status": "affected",
"version": "R34",
"versionType": "custom"
},
{
"lessThan": "*",
"status": "affected",
"version": "R33",
"versionType": "custom"
},
{
"lessThan": "R32 P5",
"status": "affected",
"version": "R32",
"versionType": "custom"
}
]
}
],
"source": "f5sirt@f5.com"
},
{
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"cpes": [
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],
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"packageName": "nginx",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "2:1.26.3-2.el10_1.1",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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],
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"product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
"vendor": "Red Hat",
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"version": "2:1.26.3-1.el10_0.8",
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]
},
{
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"packageName": "nginx:1.24",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "8100020260401080144.489197e6",
"versionType": "rpm"
}
]
},
{
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"cpes": [
"cpe:/a:redhat:enterprise_linux:9"
],
"defaultStatus": "affected",
"packageName": "nginx:1.24",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "9070020260331134728.9",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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"vendor": "Red Hat",
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]
},
{
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"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
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{
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"status": "unaffected",
"version": "9070020260407080353.9",
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]
},
{
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],
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"packageName": "nginx",
"product": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
"vendor": "Red Hat",
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{
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{
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"packageName": "nginx",
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"vendor": "Red Hat",
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{
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},
{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 9.4 Extended Update Support",
"vendor": "Red Hat",
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"status": "unaffected",
"version": "9040020260504195322.9",
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]
},
{
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],
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"packageName": "nginx",
"product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
"vendor": "Red Hat",
"versions": [
{
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"version": "2:1.20.1-22.el9_6.5",
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},
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{
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"version": "9060020260504154614.9",
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}
]
},
{
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"cpes": [
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],
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"packageName": "nginx-main",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat",
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{
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"version": "1.30.0-1.hum1",
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}
]
},
{
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"cpes": [
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],
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"product": "Red Hat Update Infrastructure 5",
"vendor": "Red Hat",
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"version": "1776868774",
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}
]
},
{
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{
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]
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
}
],
"configurations": [
{
"nodes": [
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"descriptions": [
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"value": "When the ngx_mail_auth_http_module\u00a0module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
},
{
"lang": "es",
"value": "Cuando el m\u00f3dulo ngx_mail_auth_http_module est\u00e1 habilitado en NGINX Plus o NGINX Open Source, las solicitudes no reveladas pueden causar la terminaci\u00f3n de los procesos de trabajador. Este problema puede ocurrir cuando (1) la autenticaci\u00f3n CRAM-MD5 o APOP est\u00e1 habilitada, y (2) el servidor de autenticaci\u00f3n permite reintentar al devolver el encabezado de respuesta Auth-Wait. Nota: Las versiones de software que han alcanzado el Fin del Soporte T\u00e9cnico (EoTS) no son evaluadas."
}
],
"id": "CVE-2026-27651",
"lastModified": "2026-07-15T02:19:09.153",
"metrics": {
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{
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"baseScore": 7.5,
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"modifiedAttackRequirements": "NOT_DEFINED",
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"modifiedSubIntegrityImpact": "NOT_DEFINED",
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],
"sourceIdentifier": "f5sirt@f5.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "f5sirt@f5.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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