The jpc_tsfb_synthesize function in jpc_tsfb.c in JasPer before 1.900.9 allows remote attackers to cause a denial of service (NULL pointer dereference) via vectors involving an empty sequence.
https://usn.ubuntu.com/3693-1/
https://github.com/mdadams/jasper/commit/2e82fa00466ae525339754bb3ab0a0474a31d4bd