# CVE-2026-124311: Fraunhofer HHI VVdeC NULL pointer dereference in InterPrediction

Source: https://junglewise.ai/threats/cve-2026-124311-fraunhofer-hhi-vvdec-through-3-2-1-contains-a-null-pointer  
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-2026-124311 · Severity: medium · CVSS 5.5 · Published 2026-11-07

VVdeC is a video decoder library used to decompress versatile video codec (VVC) bitstreams. An attacker can craft a malicious video file that switches decoder settings to enable reference wrap-around, causing the decoder to crash and denying access to video playback. This could affect applications and services relying on VVdeC for video processing.

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

## Quick answers

**Is CVE-2026-124311 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124311 being exploited in the wild.

**How severe is CVE-2026-124311?** Medium severity, with a CVSS score of 5.5, published 7 November 2026.

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

**Is there a fix for CVE-2026-124311?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-124311 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-124311?** 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.

## Technical details

A NULL pointer dereference exists in the InterPrediction::xPredInterBlk function when processing a crafted VVC bitstream that activates a new sequence parameter set (SPS) with sps_ref_wraparound_enabled_flag set. The decoder attempts to read from PIC_RECON_WRAP buffers that have not been allocated, resulting in a crash. The vulnerability requires a malicious bitstream supplied to the decoder but no authentication or user interaction beyond opening the file.

## Affected products

- Fraunhofer HHI VVdeC through 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/v3.2.1/source/Lib/CommonLib/InterPrediction.cpp](https://github.com/fraunhoferhhi/vvdec/blob/v3.2.1/source/Lib/CommonLib/InterPrediction.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 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 createSubPicRefBufs](https://junglewise.ai/threats/cve-2026-124308-fraunhofer-hhi-vvdec-before-3-2-1-contains-a-heap-use-after-free)
- [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)