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TI-2026-76159 Aliases CVE-2026-112007GHSA-qfh4-g83h-4vcx

Heap out-of-bounds write in Schism Tracker ULT loader

Priority MEDIUM 64CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Schism Tracker through 20260524 contains a heap out-of-bounds write flaw in its ULT module loader. The fmt_ult_load_song() function fails to limit the one-byte sample count to MAX_SAMPLES (CWE-787). An attacker who supplies a crafted .ult module can overwrite the instruments pointer array, causing the application to free attacker-chosen pointers and crash. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00128 2nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
schismtrackerSchism Trackerup to 20260524—No fix listedCNA
  • Schism Tracker Vendorschismtracker Affected up to 20260524 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Schism Tracker.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-18 Threatist record created from CVE-2026-112007
  2. 2026-10-18 Alias added: GHSA-qfh4-g83h-4vcx
  3. 2026-10-19 Affected versions changed · Red Hat
  4. 2026-10-19 CVSS score added · Red Hat
  5. 2026-10-19 CISA SSVC decision points changed

References

Exploit 1

Other 2

  • TI-2021-12119 An issue in Schism Tracker v20200412 fixed in v.20200412 allows attacker to obtain… CVSS 3.1MEDIUM 5.3
  • TI-2019-10822 An issue was discovered in Schism Tracker through 20190722. CVSS 3.1HIGH 7.8
  • TI-2019-10821 An issue was discovered in Schism Tracker through 20190722. CVSS 3.1HIGH 7.8
  • TI-2019-10784 fmt_mtm_load_song in fmt/mtm.c in Schism Tracker 20190722 has a heap-based buffer overflow. CVSS 3.1HIGH 7.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences