What’s Vulnerable › Vulnerabilities

CVE-2023-45676: Multi-byte write heap buffer overflow in start_decoder in stb_vorbis

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-21 · updated 2026-06-17
• Weakness: CWE-787

Description

stb_vorbis is a single file MIT licensed library for processing ogg vorbis files. A crafted file may trigger out of bounds write in `f->vendor[i] = get8_packet(f);`. The root cause is an integer overflow in `setup_malloc`. A sufficiently large value in the variable `sz` overflows with `sz+7` in and the negative value passes the maximum available memory buffer check. This issue may lead to code execution.

Affected products

• nothings Stb Vorbis.C: 1.22

References

• https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L3656
• https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L950-L960
• https://securitylab.github.com/advisories/GHSL-2023-145_GHSL-2023-151_stb_image_h/
• https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L3656
• https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L950-L960
• https://securitylab.github.com/advisories/GHSL-2023-145_GHSL-2023-151_stb_image_h/

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