mkvtoolnix: MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due t...
CVE-2026-90783 is fixed in 5 products on 1 platform, first by OPENSUSE-SU-2026:21867-1, released September 16, 2026. It is not reported as exploited. Patch Radar priority: High.
MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mkvtoolnix · Debian 12.15 (bookworm) | 74.0.0-1+deb12u1 | DEBIAN-CVE-2026-90783 | Sep 17, 2026 |
| mkvtoolnix · Debian 13.5 (trixie) | 92.0-1+deb13u1 | DEBIAN-CVE-2026-90783 | Sep 17, 2026 |
| mkvtoolnix · Debian 14 | 101.0-2 | DEBIAN-CVE-2026-90783 | Sep 17, 2026 |
| mkvtoolnix · Fedora 43 | 96.0-2.fc43 | FEDORA-2026-8918B368F4 | Nov 7, 2026 |
| mkvtoolnix · opensuse-leap 16.0 | 95.0-bp160.2.1 | OPENSUSE-SU-2026:21867-1 | Sep 16, 2026 |
| mkvtoolnix-debuginfo · Fedora 43 | 96.0-2.fc43 | FEDORA-2026-8918B368F4 | Nov 7, 2026 |
| mkvtoolnix-debugsource · Fedora 43 | 96.0-2.fc43 | FEDORA-2026-8918B368F4 | Nov 7, 2026 |
| mkvtoolnix-gui · Fedora 43 | 96.0-2.fc43 | FEDORA-2026-8918B368F4 | Nov 7, 2026 |
| mkvtoolnix-gui-debuginfo · Fedora 43 | 96.0-2.fc43 | FEDORA-2026-8918B368F4 | Nov 7, 2026 |
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