CVE-2026-40192 HIGH

CVE-2026-40192: Pillow is vulnerable to a FITS GZIP decompression bomb

Vendor Python-Pillow
Product Pillow
Weakness CWE-770 · Uncontrolled resource consumption
Published April 15, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

Pillow is a Python imaging library. Versions 10.3.0 through 12.1.1 did not limit the amount of GZIP-compressed data read when decoding a FITS image, making them vulnerable to decompression bomb attacks. A specially crafted FITS file could cause unbounded memory consumption, leading to denial of service (OOM crash or severe performance degradation). If users are unable to immediately upgrade, they should only open specific image formats, excluding FITS, as a workaround.

Key dates

02Disclosure timeline

April 15, 2026 CVE published
June 30, 2026 Record updated