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Pillow is vulnerable to a FITS GZIP decompression bomb

python-pillow Pillow · CVE-2026-40192
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
8.7
EPSS
0.9%
First seen
1 d ago
Status
corroborated

All python-pillow vulnerabilities