Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | < 13.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061dfPatch
- https://github.com/python-pillow/Pillow/pull/10011Issue Tracking
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84Vendor Advisory
FAQ
What is CVE-2026-96636?
CVE-2026-96636 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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_chec...
How severe is CVE-2026-96636?
CVE-2026-96636 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-96636?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.