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critical vulnerability

Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO

Fix availableCritical · CVSS 9.2EPSS 0.53%

Published Oct 21, 2026 · updated Oct 21, 2026

What to do

  1. Upgrade to a fixed version: Pillow 13.0.0.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIPillow

Vulnerable versions
>= 2.0.0, < 13.0.0
Fixed in
13.0.0

Check your project: pip show Pillow

What changed

  1. Oct 21, 2026

    Published in the GitHub Advisory Database as critical.

Sources

CWE-122 Heap-based Buffer Overflow

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