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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Python Pillow
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
|
— |
13.0.0
|
References 4
https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd…
security-advisories@github.com
https://github.com/python-pillow/Pillow/pull/10010
security-advisories@github.com
https://github.com/python-pillow/Pillow/releases/tag/13.0.0
security-advisories@github.com
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg
security-advisories@github.com