---
title: "CVE-2026-89266: stb_vorbis - Buffer Overflow"
description: "stb_vorbis through 1.22 contains a buffer overflow caused by truncation of codebook multiplicands allocation size from size_t to int in start_decoder(), letting attackers trigger heap corruption or crashes via crafted Ogg Vorbis files, exploit requires crafted file."
url: https://panop.io/threat-heartbeat/CVE-2026-89266/
---

# CVE-2026-89266 stb\_vorbis - Buffer Overflow

stb\_vorbis through 1.22 contains a buffer overflow caused by truncation of codebook multiplicands allocation size from size\_t to int in start\_decoder(), letting attackers trigger heap corruption or crashes via crafted Ogg Vorbis files, exploit requires crafted file.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.64% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89266)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Published

12 September 2026

Updated

15 October 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to the latest version beyond 1.22.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89266](https://nvd.nist.gov/vuln/detail/CVE-2026-89266)
- [https://github.com/nothings/stb/issues/1947](https://github.com/nothings/stb/issues/1947)
- [https://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicands](https://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicands)
- [https://github.com/nothings/stb](https://github.com/nothings/stb)
- [https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb\_vorbis.c#L3878-L3880](https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L3878-L3880)
- [https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb\_vorbis.c#L950](https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L950)
- [https://github.com/nothings/stb/issues/1928](https://github.com/nothings/stb/issues/1928)
- [https://github.com/nothings/stb/issues/1933](https://github.com/nothings/stb/issues/1933)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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