CVE-2026-28367High· 8.7▾ TwilightA 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 47.8 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.7%
Last analysed / modified upstream
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.
build_of_apache_camel_-_hawtio = 4.0build_of_apache_camel_for_spring_boot = 4.0data_grid = 8.0fuse = 7.0.0jboss_enterprise_application_platform = 7.0.0jboss_enterprise_application_platform = 8.0.0jboss_enterprise_application_platform_expansion_packprocess_automation = 7.0single_sign-on = 7.0undertowRefer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-28369High· 8.7A flaw was found in Undertow
CVE-2026-28368High· 8.7A flaw was found in Undertow
CVE-2024-7885High· 7.5A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses the same StringBuilder instance across multiple requests
CVE-2025-3910Medium· 5.4A flaw was found in Keycloak
CVE-2026-17059Medium· 6.5A flaw was found in the role-users endpoint of the keycloak-services library, which is the core component of the Keycloak identity and access management solution
CVE-2026-9796Medium· 6.5A flaw was found in Keycloak