Medium severity · published Oct 18, 2026
CVE-2026-112007
Schism Tracker through 20260524 Heap Out-of-Bounds Write via ULT Loader
6.1
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ST
Schism Tracker · schismtracker
through 20260524 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-112007
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112007
github.com
https://github.com/schismtracker/schismtracker
github.com
https://github.com/schismtracker/schismtracker/blob/74215ae300b555928332e03152dfcdc898f96ca6/fmt/ult.c#L319-L330
hackmd.io
https://hackmd.io/@haindpwn/schismtracker-ult-sample-count-oob-write
www.vulncheck.com
https://www.vulncheck.com/advisories/schism-tracker-through-20260524-heap-out-of-bounds-write-via-ult-loader
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