Pillow has an integer overflow when processing fonts

MEDIUM 5.5CVE-2026-42308 · BIT-pillow-2026-42308 · GHSA-wjx4-4jcj-g98j · Published 09/05/2026 · updated 24/07/2026

Package	Affected versions	Patched versions
pillow PyPI	`< 12.2.0`	`12.2.0`
pillow python	`< 12.2.0`	`12.2.0`

Description

If a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. This has been fixed.

NVD description

Pillow is a Python imaging library. Prior to version 12.2.0, if a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. This issue has been patched in version 12.2.0.

References

python-pillow/Pillow security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-42308 · ADVISORY
pypa/advisory-database · WEB
python-pillow/Pillow · PACKAGE
python-pillow/Pillow release 12.2.0 · WEB

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