CVE-2026-81638 Non-canonical ULID spellings are accepted and alias to the same record in ash_double_entry

Improper Handling of Alternate Encoding vulnerability in ash-project ashdoubleentry allows an attacker to submit several distinct string spellings of the same identifier. AshDoubleEntry.ULID renders a 128-bit ULID as 26 Crockford base-32 characters, but the first character encodes only 3 bits, so...