GHSA-5xmw-vc9v-4wf2

Pillow has a heap buffer overflow with nested list coordinates

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-42309

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pillow	>= 11.2.1, < 12.2.0	12.2.0

Details

As written in the advisory (Markdown source, shown as plain text).

Passing nested lists as coordinates to APIs that accept coordinates such as `ImagePath.Path`, `ImageDraw.ImageDraw.polygon` and `ImageDraw.ImageDraw.line` could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This was introduced in Pillow 11.2.1.

References

External links from the advisory. They lead to third-party sites.

https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xmw-vc9v-4wf2 web
https://nvd.nist.gov/vuln/detail/CVE-2026-42309 advisory
https://github.com/designcomputer/mysql_mcp_server/commit/a96549f4a4d65443fd6e9c7f2324fba9a5c80a82 web
https://github.com/python-pillow/Pillow/commit/cf6de8ca9b23e714aa5310e1c791eda66fc0b670 web
https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2026-2251.yaml web
https://github.com/python-pillow/Pillow package
https://github.com/python-pillow/Pillow/releases/tag/12.2.0 web