CVE-2026-54058

Pillow is a Python imaging library. Prior to 12.3.0, when Pillow loads an uncompressed McIdas AREA image from a filename through the mmap raw codec path, attacker-controlled header words can set a row stride smaller than the natural row width, causing pixel access such as Image.tobytes(), getpixel, convert, or save to read beyond the mapped region and disclose adjacent process memory or fault. This issue is fixed in version 12.3.0.

Score

CVSS 3.1 9.1 Critical

Status

Analyzed - security-advisories@github.com

Published

2026-07-14

Last modified

2026-10-24

Weaknesses

CWE-125

Affected products

• Pillow (Python)
• Pillow (Python-pillow)

References

• https://github.com/python-pillow/Pillow/security/advisories/GHSA-62p4-gmf7-7g93
• https://github.com/python-pillow/Pillow/pull/9719
• https://github.com/python-pillow/Pillow/commit/6a8de891fb00968e5ea79bfa84368ed90b3cfc1d
• https://github.com/python-pillow/Pillow/releases/tag/12.3.0