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HIGH

CVE-2026-89266

CVSS v3

8.2

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

stb_vorbis through 1.22 contains a heap buffer overflow in start_decoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process crashes or heap corruption.

Technical details

Published
2026-09-12
Last Modified
2026-09-12

Frequently asked questions

What is CVE-2026-89266?

stb_vorbis through 1.22 contains a heap buffer overflow in start_decoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process crashes or heap corruption.

Is CVE-2026-89266 actively exploited?

Active exploitation of CVE-2026-89266 has not been confirmed. Its EPSS score was 0.6% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-89266?

CVE-2026-89266 has a CVSS v3 base score of 8.2 (HIGH severity).

Is CVE-2026-89266 affecting your environment?

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