CVE-2026-42308 PUBLISHED

Pillow: Integer overflow when processing fonts

Assigner: GitHub_M
Reserved: 26.04.2026 Published: 09.05.2026 Updated: 09.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	python-pillow
Product	Pillow
Versions	Version < 12.2.0 is affected

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-wjx4-4jcj-g98j
https://github.com/python-pillow/Pillow/releases/tag/12.2.0

Problem Types

CWE-190: Integer Overflow or Wraparound CWE