What’s Vulnerable › Vulnerabilities

CVE-2026-89266: stb_vorbis through 1.22 heap buffer overflow via codebook multiplicands

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-12 · updated 2026-09-24
• Weakness: CWE-787

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: through 1.22

References

• 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#L950
• https://github.com/nothings/stb/issues/1928
• https://github.com/nothings/stb/issues/1933
• https://github.com/nothings/stb/issues/1947
• https://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicands

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