Vulnerability · Published Sep 11, 2026 · Assigned by VulnCheck
CVE-2026-89266stb_vorbis through 1.22 heap buffer overflow via codebook multiplicands
High 8.2
In plain English
A high-severity out-of-bounds write in stb_vorbis from nothings. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.6%top 49.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libstb | no fix listed | DEBIAN-CVE-2026-89266 |
| Debian:13 | libstb | no fix listed | DEBIAN-CVE-2026-89266 |
| Debian:14 | libstb | no fix listed | DEBIAN-CVE-2026-89266 |
| Ubuntu:22.04:LTS | libstb | no fix listed | UBUNTU-CVE-2026-89266 |
| Ubuntu:24.04:LTS | libstb | no fix listed | UBUNTU-CVE-2026-89266 |
| Ubuntu:26.04:LTS | libstb | no fix listed | UBUNTU-CVE-2026-89266 |
| Ubuntu:26.10 | libstb | no fix listed | UBUNTU-CVE-2026-89266 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nothings | stb_vorbis | 0 – through 1.22 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- GitHub Issue #1928 issue-tracking
- GitHub Issue #1933 issue-tracking
- GitHub Issue #1947 issue-tracking
- Vulnerable multiplicands allocation (stb_vorbis.c:3878-3880) technical-description
- setup_malloc int size parameter (stb_vorbis.c:950) technical-description
- https://github.com/nothings/stb product
- VulnCheck Advisory: stb_vorbis through 1.22 heap buffer overflow via codebook multiplicands third-party-advisory