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CVE-2026-28367

Undertow: undertow: request smuggling via `\r\r\r` as a header block terminator

CVSS 3.1 8.7 HIGHCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-28367

Published

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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Affected versions, risk and source history

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CVE-2026-28367 · CVE overview and exploitation status

cve-program · CVE-2026-28367

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