Buffer overflow in Nothings Stb Vorbis
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.006 (50.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/nothings/stb/issues/1928 (issue-tracking)
- github.com/nothings/stb/issues/1933 (issue-tracking)
- github.com/nothings/stb/issues/1947 (issue-tracking)
- github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbi… (technical-description)
- github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbi… (technical-description)
- github.com/nothings/stb (product)
- www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-c… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89266?
- CVE-2026-89266 is a high-severity vulnerability in Nothings Stb Vorbis, classified under Out-of-bounds Write. CVSS score: 8.2/10. Published 2026-09-12.
- How severe is CVE-2026-89266?
- High severity. CVSS v3 base score is 8.2 out of 10.