# CVE-2026-124308: Fraunhofer HHI VVdeC heap use-after-free in createSubPicRefBufs

Source: https://junglewise.ai/threats/cve-2026-124308-fraunhofer-hhi-vvdec-before-3-2-1-contains-a-heap-use-after-free  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-07. Updated: 2026-11-07  
License: CC BY 4.0 with a link back

CVE-2026-124308 · Severity: medium · CVSS 5.8 · Published 2026-11-07

Fraunhofer HHI VVdeC is a video decoder library used to process VVC (Versatile Video Codec) streams. A heap use-after-free vulnerability in the multi-threaded decoder can be triggered by a crafted video file, leading to memory corruption or decoder crashes when processing videos with multiple subpictures.

Technologies: [Fraunhofer HHI VVdeC](https://junglewise.ai/threats/technologies/vvdec). Vendors: [Fraunhofer HHI](https://junglewise.ai/threats/vendors/fraunhofer-hhi).

## Quick answers

**Is CVE-2026-124308 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124308 being exploited in the wild.

**How severe is CVE-2026-124308?** Medium severity, with a CVSS score of 5.8, published 7 November 2026.

**Which products and versions are affected?** Fraunhofer HHI VVdeC before 3.2.1.

**Is there a fix for CVE-2026-124308?** Yes: fixed in 3.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-124308 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-124308?** Check whether you run Fraunhofer HHI VVdeC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.2.1

## Technical details

The vulnerability is a heap use-after-free in DecLibRecon::createSubPicRefBufs where the decompressPicture function clears m_subPicExtTasks without waiting for pending asynchronous tasks to complete. An attacker supplying a crafted multi-subpicture VVC bitstream to a decoder using two or more threads can trigger heap memory corruption or denial of service. The fix is available in version 3.2.1.

## Affected products

- Fraunhofer HHI VVdeC before 3.2.1

## Timeline

- 2026-11-07: disclosed

## References

- [https://github.com/fraunhoferhhi/vvdec](https://github.com/fraunhoferhhi/vvdec)
- [https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/DecLibRecon.cpp](https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/DecLibRecon.cpp)

## Related threats

- [Fraunhofer HHI VVdeC heap out-of-bounds read](https://junglewise.ai/threats/cve-2026-124312-fraunhofer-hhi-vvdec-through-3-2-1-contains-a-heap-out-of-bounds)
- [Fraunhofer HHI VVdeC NULL pointer dereference in InterPrediction](https://junglewise.ai/threats/cve-2026-124311-fraunhofer-hhi-vvdec-through-3-2-1-contains-a-null-pointer)
- [Fraunhofer HHI VVdeC out-of-bounds read in inter prediction](https://junglewise.ai/threats/cve-2026-124310-fraunhofer-hhi-vvdec-before-3-2-1-contains-an-out-of-bounds-read)
- [Fraunhofer HHI VVdeC heap out-of-bounds read in SEI parsing](https://junglewise.ai/threats/cve-2026-124309-fraunhofer-hhi-vvdec-before-3-2-1-contains-a-heap-out-of-bounds)
- [Fraunhofer HHI VVdeC heap use-after-free in ALF decoding](https://junglewise.ai/threats/cve-2026-124307-fraunhofer-hhi-vvdec-before-3-2-1-contains-a-heap-use-after-free)