Bug 2554766 (CVE-2026-112007)

Summary: CVE-2026-112007 schismtracker: Schism Tracker: Denial of Service via crafted ULT module file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Schism Tracker. An attacker could exploit this vulnerability by enticing a user to open a specially crafted UltraTracker (.ult) audio file. Due to missing boundary checks on sample counts during file parsing, the application performs an out-of-bounds memory write on the heap. This flaw can corrupt application memory and cause the program to crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-10-18 11:42:34 UTC 
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.