CVE-2026-96644
Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.
Published:Oct 21, 2026
Last Modified:Oct 27, 2026
EPS:Oct 21, 2026
EPSS Score:0.00412
CVSS Score:8.1
Affected Products
Vendor
Product
Action
Vendor
Microsoft
Product
Windows
Microsoft
Windows
Vendor
Python
Product
Pillow
Python
Pillow
Vendor
Python-pillow
Product
Pillow
Python-pillow
Pillow
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
Related CVEs
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
