CVE-2026-96641: CWE-190: Integer Overflow or Wraparound in python-pillow Pillow
Description
Pillow is a Python imaging library. Prior to 13.0.0, PILfont text-width accumulation in src/_imaging.c checks positive glyph advances against INT_MAX but does not check negative advances against INT_MIN. Repeating a signed 16-bit advance of -32768 can therefore execute a signed C integer overflow in xsize += dx, producing a large positive width from a negative mathematical result. Applications that use getlength(), getsize(), or derived layout, quota, serialization, or allocation calculations can experience logic-integrity errors or resource consumption, while the high-level mask path commonly retains a decompression-bomb check. This issue is fixed in version 13.0.0.
CVSS v3.1
Score 6.5medium
Affected software
python-pillow
Pillow
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-23T14:35:50.130Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad928464d27ba8daa01072c
Added to database: 10/21/2026, 21:01:58 UTC
Last updated: 10/21/2026, 21:01:58 UTC
Views: 1
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