---
id: "CVE-2026-124309"
page: "https://infrastack.ai/live/CVE-2026-124309"
kind: "vulnerability"
aliases: ["CVE-2026-124309"]
title: "VVdeC: crafted VVC bitstream reads past heap, crashes decoder or leaks memory"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "package", "video-decoding", "vvdec"]
not_affected_if: ["no-untrusted-vvc-input", "vvdec-3.2.1-or-later"]
published_at: "2026-11-07T15:17:14+00:00"
first_seen_at: "2026-11-07T15:47:57+00:00"
updated_at: "2026-11-07T15:48:14+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124309", "first_seen_at": "2026-11-07T15:47:57+00:00"}]
exploit_sources: []
---

# VVdeC: crafted VVC bitstream reads past heap, crashes decoder or leaks memory

Link for people: https://infrastack.ai/live/CVE-2026-124309 (this .md is for agents)

VVdeC is Fraunhofer HHI's open-source decoder for the VVC video format. A crafted VVC bitstream with a nested SEI message makes the decoder read past a heap allocation, which can crash it or copy adjacent heap memory.

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

## How to check

- Check the installed VVdeC version against the `3.2.1` fixed release.
- Find whether an application links VVdeC or the `vvdec` library and decodes untrusted VVC input.

## Fix

- VVdeC `3.2.1` (fixed version per the NVD description: versions before 3.2.1 are affected).

## Timeline

- 2026-11-07T15:47:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124309

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/fraunhofer-hhi-vvdec-before-3.2.1-heap-out-of-bounds-read-via-seireader-xparseseiscalablenesting
- [fix] Patch: github.com https://github.com/fraunhoferhhi/vvdec/commit/1d657c7a822987d2ff935e9c227c5faf5318ca06

## From the sources

Fraunhofer HHI VVdeC before 3.2.1 contains a heap out-of-bounds read vulnerability in SEIReader::xParseSEIScalableNesting that allows attackers to read past heap allocations by casting the SEI wrapper object instead of its payload. Attackers can supply a crafted VVC bitstream with a scalable nesting SEI containing a nested buffering period SEI to crash the decoder or copy adjacent heap memory.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_