---
id: "CVE-2026-124308"
page: "https://infrastack.ai/live/CVE-2026-124308"
kind: "vulnerability"
aliases: ["CVE-2026-124308"]
title: "VVdeC: heap use-after-free lets a crafted VVC stream corrupt memory"
severity: "medium"
cvss: 5.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "package", "video-decoding", "vvdec"]
not_affected_if: ["no-vvc-decoding", "single-threaded-decoding", "trusted-input-only"]
published_at: "2026-11-07T15:17:14+00:00"
first_seen_at: "2026-11-07T15:47:57+00:00"
updated_at: "2026-11-07T15:48:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124308", "first_seen_at": "2026-11-07T15:47:57+00:00"}]
exploit_sources: []
---

# VVdeC: heap use-after-free lets a crafted VVC stream corrupt memory

Link for people: https://infrastack.ai/live/CVE-2026-124308 (this .md is for agents)

VVdeC is Fraunhofer HHI's open-source VVC video decoder library. A crafted multi-subpicture VVC bitstream decoded with two or more threads can trigger a heap use-after-free, corrupting memory or crashing the decoder.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed VVdeC version against the fixed release, for example with `vvdec --version` or the version in your package manifest.
- Find where VVdeC is linked or built into your applications, and whether decoding runs with two or more threads.

## Fix

- VVdeC: upgrade to `3.2.1` or later (per the NVD description: before 3.2.1 is affected).

## Timeline

- 2026-11-07T15:47:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124308

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/fraunhofer-hhi-vvdec-before-3.2.1-use-after-free-via-declibrecon-createsubpicrefbufs
- [fix] Patch: github.com https://github.com/fraunhoferhhi/vvdec/commit/8a0def8ba6050412d33e69a6f1e66e287b039083

## From the sources

Fraunhofer HHI VVdeC before 3.2.1 contains a heap use-after-free vulnerability in DecLibRecon::createSubPicRefBufs because decompressPicture clears m_subPicExtTasks without waiting for pending tasks. Attackers can supply a crafted multi-subpicture VVC bitstream to decoders using two or more threads, causing heap memory corruption or a decoder crash.

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