Buffer overflow in Schismtracker Schism Tracker
CVE-2026-112007
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haindpwn/schismtracker-ult-sample-count-oob-write (technical-description, exploit)
- github.com/schismtracker/schismtracker/blob/74215ae300b555928332e03152dfcdc898f… (technical-description)
- github.com/schismtracker/schismtracker (product)
- www.vulncheck.com/advisories/schism-tracker-through-20260524-heap-out-of-bounds… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112007?
- CVE-2026-112007 is a medium-severity vulnerability in Schismtracker Schism Tracker, classified under Out-of-bounds Write. CVSS score: 6.1/10. Published 2026-10-18.
- How severe is CVE-2026-112007?
- Medium severity. CVSS v3 base score is 6.1 out of 10.