CVE-2026-96636

Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.

• https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48
• https://github.com/python-pillow/Pillow/pull/10011
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84

• https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48
• https://github.com/python-pillow/Pillow/pull/10011
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84

• HIGHCVE-2026-107227PoC
• HIGHCVE-2026-63452PoC
• MEDIUMCVE-2026-65827PoC
• HIGHCVE-2026-85721PoC
• UNSCOREDCVE-2026-86104
• UNSCOREDCVE-2026-96637PoC
• HIGHCVE-2025-52290
• HIGHCVE-2026-100137

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