Name: CVE-2026-42310: Loop with Unreachable Exit Condition
Creator: Rapid7
Published: 2026-05-09T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-42310, CWE-835, CVSS 5.5, EPSS 0.00177

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.

CVSS Details

CVSS 4.0 Base Score: 5.1 (MEDIUM)
CVSS 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 5.5
CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Amazon_linux_2023	—	Upgrade python3-pillowUpgrade python3-pillow-tk-debuginfoUpgrade python-pillow-debuginfoUpgrade python3-pillow-debuginfoUpgrade python3-pillow-tkUpgrade python-pillow-debugsourceUpgrade python3-pillow-devel	May 28, 2026	May 9, 2026
Debian	—	Upgrade pillow	Jul 23, 2026	Jul 23, 2026
Ubuntu	—	Upgrade python3-pil	Jun 8, 2026	May 9, 2026

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CVSS Details

Covered by Rapid7

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