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

Status: published. Published: 2026-11-07. Updated: 2026-11-07.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/fraunhoferhhi/vvdec/commit/8a0def8ba6050412d33e69a6f1e66e287b039083

## Affected products and versions

- fraunhoferhhi / vvdec (fraunhoferhhi/vvdec): ≥ 0; < 3.2.1 (affected, semver); 3.2.1 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.8 (medium); 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; source: CNA: VulnCheck

- CVSS 3.1: 5.8 (medium); CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-416

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/fraunhoferhhi/vvdec/issues/403 (CNA: VulnCheck; issue-tracking)

- https://github.com/fraunhoferhhi/vvdec/issues/392 (CNA: VulnCheck; issue-tracking)

- https://github.com/fraunhoferhhi/vvdec/commit/8a0def8ba6050412d33e69a6f1e66e287b039083 (CNA: VulnCheck; patch)

- https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/DecLibRecon.cpp#L405-L420 (CNA: VulnCheck; technical-description)

- https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/DecLibRecon.cpp#L538-L542 (CNA: VulnCheck; technical-description)

- https://github.com/fraunhoferhhi/vvdec (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/fraunhofer-hhi-vvdec-before-3.2.1-use-after-free-via-declibrecon-createsubpicrefbufs (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-124308; retrieved 2026-11-07; source updated 2026-11-07

Revision: c0de8f12bbe9cf922e83fa706da7e60023091d9a88673f619b3a3bd2ef4b6b33

Canonical: https://y2.dev/cve/CVE-2026-124308

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