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CVE-2026-96639

9.8 · CRITICAL

Pillow is a Python imaging library.

Published Oct 21, 2026pythonCWE-125EPSS 0.66%

Overview

CVE-2026-96639 is a critical-severity vulnerability affecting python pillow. It was published on October 21, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from python. Update pillow to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
pythonpillow>= 11.0.0, < 13.0.0Affected

References

GitHubgithub.com/python-pillow/Pillow/commit/78d97d994579aef81aafe123773d525f40f2522aGitHubgithub.com/python-pillow/Pillow/pull/10105GitHubgithub.com/python-pillow/Pillow/releases/tag/13.0.0GitHubgithub.com/python-pillow/Pillow/security/advisories/GHSA-v9pv-5gc8-w2m6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-96639?

CVE-2026-96639 is a critical-severity vulnerability affecting python pillow. It was published on October 21, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-96639?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-96639?

Check the references section for vendor advisories and patches from python. Update pillow to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-96639?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-96639 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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