CVE-2026-28369
Full vulnerability record from the local CVENow database.
Description
A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.
Severity
CRITICAL
CVSS score
9.1
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-03-27 17:16:28.240000
Last modified
2026-10-26 21:10:00.170000
View original CVE JSON
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"sourceIdentifier": "[email protected]",
"published": "2026-03-27T17:16:28.240",
"lastModified": "2026-10-26T21:10:00.170",
"vulnStatus": "Modified",
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"value": "A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure."
},
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"value": "Se encontró una vulnerabilidad en Undertow. Cuando Undertow recibe una solicitud HTTP donde la primera línea de la cabecera comienza con uno o más espacios, procesa incorrectamente la solicitud al eliminar estos espacios iniciales. Este comportamiento, que viola los estándares HTTP, puede ser explotado por un atacante remoto para realizar contrabando de solicitudes. El contrabando de solicitudes permite a un atacante eludir mecanismos de seguridad, acceder a información restringida o manipular cachés web, lo que podría llevar a acciones no autorizadas o exposición de datos."
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