Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots

Impact

The serviceAccounts and notServiceAccounts fields in AuthorizationPolicy incorrectly interpret dots (.) as a regular expression matcher. Because . is a valid character in a service account name, an AuthorizationPolicy ALLOW rule targeting SA e.g. cert-manager.io also matches cert-manager-io, cert-managerXio, etc. A DENY rule targeting the same name fails to block those variants.

Patches

Fixes are available in 1.29.2, 1.28.6, and 1.27.9

Workarounds

None