Critical 9.8Published Oct 21, 2026

CVE-2026-96639Pillow multi-frame loaders can reuse stale native image storage after mode transitions

Updated under an hour ago (Oct 28, 2026, 4:10 PM ET)

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It affects python-pillow Pillow and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.67%, higher than 52% of scored CVEs.

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Every CVE for python-pillow Pillow

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125, CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.67% (percentile 52)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

python-pillow Pillow python_pillow:pillow (from the name)	from 11.0.0, < 13.0.0	CNA record
python pillow python:pillow	from 11.0.0 before 13.0.0	NVD

References

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-v9pv-5gc8-w2m6	x-refsource-confirm, vendor-advisory
https://github.com/python-pillow/Pillow/pull/10105	x-refsource-misc, issue-tracking
https://github.com/python-pillow/Pillow/commit/78d97d994579aef81aafe123773d525f40f2522a	x-refsource-misc, patch
https://github.com/python-pillow/Pillow/releases/tag/13.0.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.