Vulnerability Details CVE-2026-96639
Pillow is a Python imaging library. From 11.0.0 until 13.0.0, multi-frame loaders can retain an ImagingCore allocation created for a narrow frame mode while a later frame of the same dimensions changes the logical mode and decoder tiles to wider RGB or CMYK data. ImageFile.load_prepare() reuses the stale native storage because _im is non-null without verifying that its mode and size still match. Crafted PSD, MPO, DCX, or MIC frame transitions can then write wider pixels into the narrow allocation, causing native out-of-bounds writes and crashes. The MPO path can also cause a native over-read and, in demonstrated runtime-specific profiles, command execution. This issue is fixed in version 13.0.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 51.4%
CVSS Severity
CVSS v3 Score 9.8
References
Products affected by CVE-2026-96639
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cpe:2.3:a:python:pillow:11.0.0
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cpe:2.3:a:python:pillow:11.1.0
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cpe:2.3:a:python:pillow:11.2.1
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cpe:2.3:a:python:pillow:11.3.0
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cpe:2.3:a:python:pillow:12.0.0
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cpe:2.3:a:python:pillow:12.1.0
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cpe:2.3:a:python:pillow:12.1.1
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cpe:2.3:a:python:pillow:12.2.0