CVE-2026-112007
Schism Tracker through 20260524 Heap Out-of-Bounds Write via ULT Loader
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 18, 2026
- Updated
- Oct 19, 2026
- Reserved
- Oct 18, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H | VulnCheck |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
Schism Trackerschismtracker |
|
References
- https://hackmd.io/@haindpwn/schismtracker-ult-sample-count-oob-writetechnical-descriptionexploit
- https://github.com/schismtracker/schismtracker/blob/74215ae300b555928332e03152dfcdc898f96ca6/fmt/ult.c#L319-L330technical-description
- https://github.com/schismtracker/schismtrackerproduct
- VulnCheck Advisory: Schism Tracker through 20260524 Heap Out-of-Bounds Write via ULT Loaderthird-party-advisory
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