CVE-2026-96636
Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 CWE-409 |
| Vendor | python-pillow |
| Product | pillow |
| Published | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
python-pillow / Pillow
< 13.0.0
References
github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84 github.com: https://github.com/python-pillow/Pillow/pull/10011 github.com: https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48 github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0