Inefficient Regular Expression Complexity Affecting py3-pillow package, versions <13.0.0-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.29% (21st percentile)

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  • Snyk IDSNYK-WOLFILATEST-PY3PILLOW-21479112
  • published23 Oct 2026
  • disclosed19 Oct 2026

Introduced: 19 Oct 2026

NewCVE-2026-112901  (opens in a new tab)
CWE-1333  (opens in a new tab)

How to fix?

Upgrade Wolfi py3-pillow to version 13.0.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream py3-pillow package and not the py3-pillow package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's XBM header parser is vulnerable to regular-expression denial of service. In XbmImageFile._open, when an application calls Image.open() on a small crafted XBM file, XbmImagePlugin applies a backtracking expression to the attacker-controlled header before image dimensions are accepted, stalling a worker for minutes and denying service. This issue is fixed in version 13.0.0.

CVSS Base Scores

version 3.1