Use After Free Affecting py3-pillow package, versions <13.0.0-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.69% (53rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-PY3PILLOW-21663659
  • published24 Oct 2026
  • disclosed19 Oct 2026

Introduced: 19 Oct 2026

NewCVE-2026-112396  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Chainguard 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 Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Pillow is a Python imaging library. From 11.3.0 until 13.0.0, Pillow has a heap use-after-free when libtiff rejects a tag while encoding TIFF data to an in-memory buffer. When an application saves attacker-influenced TIFF tags to BytesIO, libtiff can reject a tag during encoding in ImagingLibTiffEncode; the error path then frees the output buffer without closing or clearing the TIFF handle, and later cleanup flushes through the write callback into freed memory, which can crash the process and may enable code execution. This issue is fixed in version 13.0.0.

CVSS Base Scores

version 3.1