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HIGH

CVE-2026-90783

MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound

CVSS v3

7.8

HIGH

EPSS Score

0.2 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

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.

Technical details

Published
2026-09-13
Last Modified
2026-09-13

Frequently asked questions

What is CVE-2026-90783?

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.

Is CVE-2026-90783 actively exploited?

Active exploitation of CVE-2026-90783 has not been confirmed. Its EPSS score was 0.2% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-90783?

CVE-2026-90783 has a CVSS v3 base score of 7.8 (HIGH severity).

Is CVE-2026-90783 affecting your environment?

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