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    CVE-2026-112399

    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.

    Published:Oct 19, 2026
    Last Modified:Oct 28, 2026
    EPS:Oct 19, 2026
    EPSS Score:0.00529
    CVSS Score:7.5

    Affected Products

    Vendor
    Python
    Product
    Pillow
    Vendor
    Python-pillow
    Product
    Pillow

    Exploits

    https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9

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    Common Vulnerability Scoring System

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    User Interaction
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    Integrity
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