nothings stb_vorbis up to 1.22 start_decoder heap-based overflow

Summaryinfo

A vulnerability was found in nothings stb_vorbis up to 1.22 and classified as critical. This affects the function start_decoder. Executing a manipulation can lead to heap-based overflow. This vulnerability is registered as CVE-2026-89266. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in nothings stb_vorbis up to 1.22. It has been declared as critical. This vulnerability affects the function start_decoder. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-89266 since 09/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/12/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• nothings

Name

• stb_vorbis

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22

CPE 2.3info

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CPE 2.2info

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Entryinfo

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