Out-of-bounds Write Affecting python-pillow package, versions <0:2.0.0-23.gitd1c6db8.amzn2.0.20


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

Social Trends
EPSS
0.44% (36th percentile)

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  • Snyk IDSNYK-AMZN2-PYTHONPILLOW-18523445
  • published5 Aug 2026
  • disclosed14 Jul 2026

Introduced: 14 Jul 2026

CVE-2026-59197  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python-pillow to version 0:2.0.0-23.gitd1c6db8.amzn2.0.20 or higher.
This issue was patched in ALAS2-2026-3839.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-pillow package and not the python-pillow package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.

CVSS Base Scores

version 3.1