Bug 2532532 (CVE-2026-89266)

Summary: CVE-2026-89266 stb_vorbis: stb_vorbis: Denial of Service due to heap buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in stb_vorbis, an open-source library for Ogg Vorbis decoding. This vulnerability, a heap buffer overflow, occurs in the `start_decoder()` function due to an integer truncation error when allocating memory for codebook multiplicands. A remote attacker could exploit this by crafting a specially malformed Ogg Vorbis file. Successful exploitation could lead to out-of-bounds writes, causing the application to crash or corrupt memory, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2532939, 2532940, 2532941, 2532942    
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Description OSIDB Bzimport 2026-09-11 23:51:39 UTC 
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.