CVE-2026-96638
Published:October 21, 2026
Updated:October 22, 2026
Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.
Affected Packages
pillow (CONDA):
Affected version(s) >=9.1.0 <13.0.0Fix Suggestion:
Update to version 13.0.0https://github.com/python-pillow/Pillow.git (GITHUB):
Affected version(s) >=12.0.0 <13.0.0Fix Suggestion:
Update to version 13.0.0pillow (PYTHON):
Affected version(s) >=12.0.0 <13.0.0Fix Suggestion:
Update to version 13.0.0pillow (PYTHON):
Affected version(s) >=9.1.0 <13.0.0Fix Suggestion:
Update to version 13.0.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.28