Quick answers
- Is CVE-2026-124309 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124309 being exploited in the wild.
- How severe is CVE-2026-124309?
- Medium severity, with a CVSS score of 6.1, published 7 November 2026.
- Which products and versions are affected?
- Fraunhofer HHI VVdeC before 3.2.1.
- Is there a fix for CVE-2026-124309?
- 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-2026-124309 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-124309?
- 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 exists in SEIReader::xParseSEIScalableNesting, where the code incorrectly casts a SEI wrapper object instead of its payload, leading to out-of-bounds heap reads. An attacker can craft a VVC bitstream with a scalable nesting SEI containing a nested buffering period SEI to trigger memory corruption. The flaw affects versions before 3.2.1.
Affected products
- Fraunhofer HHI VVdeC before 3.2.1
Timeline
- 2026-11-07: disclosed