A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack.
https://access.redhat.com/errata/RHSA-2026:4924
https://access.redhat.com/errata/RHSA-2026:4917
https://access.redhat.com/errata/RHSA-2026:4916
https://access.redhat.com/errata/RHSA-2026:4915
https://access.redhat.com/errata/RHSA-2026:3892
https://access.redhat.com/errata/RHSA-2026:3891
https://access.redhat.com/errata/RHSA-2026:3889
https://access.redhat.com/errata/RHSA-2026:0386