Pillow: Out-of-bounds access in _imagingmorph on a zero-width image
At a glance
Severity
HIGH 8.7
EPSS
EPSS 0.49 % · percentile 42 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
GitHub_M
NVD status
Analyzed
Description
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's ImageMorph.MorphOp.apply() can access memory before a row buffer for a zero-width image. PPM and PGM input can create an image with width zero, and the native morphology routine indexes outrow[width - 1] without rejecting that geometry. An attacker can supply such an image to an application that applies a morphology operation. This can crash the process. This issue is fixed in version 13.0.0.
GHSA-58r4-6rv3-gfh8 — Pillow: Out-of-bounds access in _imagingmorph on a zero-width image
PYSEC-2026-4329 — Pillow is a Python imaging library. Prior to 13.0.0, Pillow's ImageMorph.MorphOp.apply() can access memory before a row buffer for a zero-width image. PPM and P
