Is validating arbitrary json with arbitrary jsonschema secure?

[F483]

It would be an elegant interface for the pubsub system to have events be json and subscriptions be jsonschema so that the event matching is easy to implement in any language.

from jsonschema import validate
from jsonschema.exceptions import ValidationError
try:
    validate(untrusted_event, untrusted_subscribe_schema)
    event_matches_schema = True
except ValidationError:
    event_matches_schema = False

The question is, is it safe to validate untrusted events with untrusted schemas?

Immediately to mind come issues like regex backtracking vounerabilities since jsonschema supports checking strings against regex, so that would have to be disabled.

Are there other attack vectors and does a security analysis of this approach exist?

Note that events are limited to 512bytes (including subscription events).