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CVE-2026-112399

7.5 · HIGH

Pillow is a Python imaging library.

Published Oct 19, 2026pythonCWE-789EPSS 0.53%

Overview

CVE-2026-112399 is a high-severity vulnerability affecting python pillow. It was published on October 19, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. 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 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. 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>= 8.1.0, < 13.0.0Affected

References

GitHubgithub.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48GitHubgithub.com/python-pillow/Pillow/releases/tag/13.0.0GitHubgithub.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9GitHubgithub.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-112399?

CVE-2026-112399 is a high-severity vulnerability affecting python pillow. It was published on October 19, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-112399?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-112399?

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-2026-112399?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-112399 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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