CVE-2026-119723: Facebook HHVM: When parsing request variables such as query-string and form parameters, HHVM did not check that appending a nested…

When parsing request variables such as query-string and form parameters, HHVM did not check that appending a nested array succeeded before descending into it. A remote, unauthenticated attacker could send a GET or POST request which would crash the HHVM server process before any application code...