# CVE-2026-124312: Fraunhofer HHI VVdeC heap out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-124312-fraunhofer-hhi-vvdec-through-3-2-1-contains-a-heap-out-of-bounds  
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-2026-124312 · Severity: medium · CVSS 4.7 · Published 2026-11-07

Fraunhofer's VVdeC is a video decoder used to process VVC bitstreams. An attacker can craft a malicious video file with mismatched reference picture resolutions that triggers an out-of-bounds memory read, crashing the decoder and causing video playback to fail.

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

## Quick answers

**Is CVE-2026-124312 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124312 being exploited in the wild.

**How severe is CVE-2026-124312?** Medium severity, with a CVSS score of 4.7, published 7 November 2026.

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

**Is there a fix for CVE-2026-124312?** 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-2026-124312 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-124312?** 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 heap out-of-bounds read vulnerability exists in the getColInfo function when processing temporally co-located motion vectors (TMVP) with collocated reference pictures of different resolution. When error concealment is enabled, the decoder reads past the colMotion allocation boundary. An attacker supplies a crafted VVC bitstream to trigger the issue; no authentication or user interaction beyond opening the file is required.

## 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/CodingStructure.cpp](https://github.com/fraunhoferhhi/vvdec/blob/v3.2.1/source/Lib/CommonLib/CodingStructure.cpp)

## Related threats

- [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 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)