Schism Tracker through 20260524 Heap Out-of-Bounds Write via ULT Loader

Schism Tracker through 20260524 contains a heap out-of-bounds write vulnerability in fmt_ult_load_song() in fmt/ult.c that fails to clamp the one-byte sample count to MAX_SAMPLES. Attackers can supply a crafted .ult module that overwrites the instruments pointer array, causing csf_destroy() to free attacker-chosen pointers and crash the application.

An issue in Schism Tracker v20200412 fixed in v.20200412 allows attacker to obtain sensitive information via the fmt_mtm_load_song function in fmt/mtm.c.

An issue was discovered in Schism Tracker through 20190722. There is a heap-based buffer overflow via a large number of song patterns in fmt_mtm_load_song in fmt/mtm.c, a different vulnerability than CVE-2019-14465.

An issue was discovered in Schism Tracker through 20190722. There is an integer underflow via a large plen in fmt_okt_load_song in the Amiga Oktalyzer parser in fmt/okt.c.

fmt_mtm_load_song in fmt/mtm.c in Schism Tracker 20190722 has a heap-based buffer overflow.