# CVE-2026-89266

## Summary

- **CVE ID:** CVE-2026-89266
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-787
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 12, 2026

## 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.

## Affected Products

- nothings — stb_vorbis (0)

## References

- [CNA](https://github.com/nothings/stb/issues/1928)
- [CNA](https://github.com/nothings/stb/issues/1933)
- [CNA](https://github.com/nothings/stb/issues/1947)
- [CNA](https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L3878-L3880)
- [CNA](https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L950)
- [CNA](https://github.com/nothings/stb)
- [CNA](https://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicands)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.47%
- **EPSS Percentile:** 39.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._