CVE-2026-42310 PUBLISHED

Pillow: PDF Parsing Trailer Infinite Loop (DoS)

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

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. 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 >= 4.2.0, < 12.2.0 is affected

References

Problem Types

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') CWE