What’s Vulnerable › Vulnerabilities

CVE-2026-32836: mackron / dr_libs dr_flac.h Excessive Memory Allocation in PICTURE Metadata Parsing

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-17 · updated 2026-07-14
• Weakness: CWE-789

Description

dr_libs dr_flac.h version 0.13.3 and earlier (fixed in commits fefced4, 4f5a4cd, and 663239a) contain an uncontrolled memory allocation vulnerability in drflac__read_and_decode_metadata() that allows attackers to trigger excessive memory allocation by supplying crafted PICTURE metadata blocks. Attackers can exploit attacker-controlled mimeLength and descriptionLength fields to cause denial of service through memory exhaustion when processing FLAC streams with metadata callbacks.

Affected products

• mackron dr_libs: through 0.13.3

References

• https://github.com/mackron/dr_libs/commit/4f5a4cd3b57564d969443c580c75857e039f100a
• https://github.com/mackron/dr_libs/commit/663239a3d0460c33bd5b6e5166edcb404e3df676
• https://github.com/mackron/dr_libs/commit/fefced4a64adfb1a68a2d31d882366e56096dee8
• https://github.com/mackron/dr_libs/issues/298
• https://www.vulncheck.com/advisories/mackron-dr-libs-excessive-memory-allocation-in-picture-metadata-parsing

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