CVE-2026-105250: vgmstream divide by zero in Microsoft IMA decoder

CVE-2026-105250 · Severity: medium · CVSS 4.3 · Published 2026-10-05

vgmstream is a library that decodes audio formats used in video games. A malformed audio file can cause a divide-by-zero error in the Microsoft IMA ADPCM decoder, crashing any application that uses vgmstream to play untrusted audio files. This results in denial of service.

Technologies: Vgmstream. Vendors: Vgmstream.

Quick answers

Is CVE-2026-105250 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-105250 being exploited in the wild.
How severe is CVE-2026-105250?
Medium severity, with a CVSS score of 4.3, published 5 October 2026.
Which products and versions are affected?
Vgmstream up to r2117.
Is there a fix for CVE-2026-105250?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-105250 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-105250?
Check whether you run Vgmstream at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The decode_ms_ima() function in src/coding/ima_decoder.c fails to validate frame_channels and block_samples before using them in arithmetic operations, particularly a modulo operation. An attacker can craft a RIFF/WAVE file with malformed header fields to force invalid decoder geometry (non-positive channel or block sample counts) that trigger the divide-by-zero condition when the decoder processes the file.

Affected products

  • vgmstream vgmstream up to r2117

Timeline

  • 2026-08-20: disclosed
  • 2026-10-05: advisory

References

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