CVE-2026-112893: Pillow use-after-free in FreeType glyph rendering with stroker

CVE-2026-112893 · Severity: high · CVSS 4 · Published 2026-10-19

Pillow is a Python library for image processing and manipulation. An attacker can supply a malformed font file to an application using Pillow to draw text with a stroke effect, triggering a memory corruption flaw that crashes the process or potentially corrupts application data. The vulnerability affects versions 10.0.0 through 12.x.

Technologies: pillow (PyPI), Python Pillow Project Pillow. Vendors: PyPI, Python Pillow Project.

Quick answers

Is CVE-2026-112893 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-112893 being exploited in the wild.
How severe is CVE-2026-112893?
High severity, with a CVSS score of 4, published 19 October 2026.
Which products and versions are affected?
pillow (PyPI) >= 10.0.0, < 13.0.0, ECOSYSTEM:introduced=10.0.0,fixed=13.0.0; Python Pillow Project Pillow 10.0.0 through 12.x.
Is there a fix for CVE-2026-112893?
Yes. pillow (PyPI): upgrade to 13.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-112893 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-112893?
Check whether you run pillow (PyPI) or Python Pillow Project Pillow at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • pillow (PyPI): upgrade to 13.0.0 or later
    pip install "pillow>=13.0.0"

Technical details

A use-after-free vulnerability exists in the FreeType glyph rendering code when a stroker is active. If FT_Load_Glyph fails, the cleanup code attempts to free an uninitialized or stale glyph pointer via FT_Done_Glyph, causing heap corruption. An attacker can trigger the glyph-load failure path by supplying a crafted font file to any application that renders text with nonzero stroke width. The fix initializes the glyph pointer to NULL and adds proper cleanup guards.

Affected products

  • Python Pillow Project Pillow 10.0.0 through 12.x

Identifiers

  • CVE-2026-112893
  • GHSA-j4m9-6w36-pw47

Timeline

  • 2026-10-19: disclosed
  • 2026-10-16: patched: Fix released in version 13.0.0

References

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