CVE-2026-42309

MEDIUM

Pillow: Heap buffer overflow with nested list coordinates

Title source: cna
STIX 2.1

Description

Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, 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 issue has been patched in version 12.2.0.

References (2)

Core 2
Core References

Scores

CVSS v3 5.5
EPSS 0.0001
EPSS Percentile 3.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-122
Status published
Products (3)
pypi/pillow 11.2.1 - 12.2.0PyPI
python/pillow 11.2.1 - 12.2.0
python-pillow/Pillow >= 11.2.1, < 12.2.0
Published May 09, 2026
Tracked Since May 09, 2026