A flaw was found in libhangul. When parsing Hanja dictionary files, the library fails to verify that an entry contains a valid value alongside its key. By providing a specially crafted dictionary file to an application that queries it, an attacker can trigger an unexpected application crash, resulting in a Denial of Service (DoS).
https://github.com/libhangul/libhangul/issues/106
https://github.com/libhangul/libhangul/blob/5094421d9586294b2aad09924b9a54e2e6060f06/hangul/hanja.c