CVE-2026-28367
Full vulnerability record from the local CVENow database.
Description
A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.
Severity
CRITICAL
CVSS score
9.1
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-03-27 17:16:27.750000
Last modified
2026-10-30 03:16:41.440000
View original CVE JSON
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"sourceIdentifier": "[email protected]",
"published": "2026-03-27T17:16:27.750",
"lastModified": "2026-10-30T03:16:41.440",
"vulnStatus": "Modified",
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"value": "A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\\r\\r\\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests."
},
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"value": "Se encontró una falla en Undertow. Un atacante remoto puede explotar esta vulnerabilidad enviando ’\\r\\r\\r’ como un terminador de bloque de encabezado. Esto puede usarse para contrabando de solicitudes con ciertos servidores proxy, como versiones anteriores de Apache Traffic Server y Google Cloud Classic Application Load Balancer, lo que podría llevar a acceso no autorizado o manipulación de solicitudes web."
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