Vulnerability Details CVE-2026-96638
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 27.9%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-96638
-
cpe:2.3:a:python:pillow:10.0.0
-
cpe:2.3:a:python:pillow:10.0.1
-
cpe:2.3:a:python:pillow:10.1.0
-
cpe:2.3:a:python:pillow:10.2.0
-
cpe:2.3:a:python:pillow:10.3.0
-
cpe:2.3:a:python:pillow:10.4.0
-
cpe:2.3:a:python:pillow:11.0.0
-
cpe:2.3:a:python:pillow:11.1.0
-
cpe:2.3:a:python:pillow:11.2.1
-
cpe:2.3:a:python:pillow:11.3.0
-
cpe:2.3:a:python:pillow:12.0.0
-
cpe:2.3:a:python:pillow:12.1.0
-
cpe:2.3:a:python:pillow:12.1.1
-
cpe:2.3:a:python:pillow:12.2.0
-
cpe:2.3:a:python:pillow:9.1.0
-
cpe:2.3:a:python:pillow:9.1.1
-
cpe:2.3:a:python:pillow:9.2.0
-
cpe:2.3:a:python:pillow:9.3.0
-
cpe:2.3:a:python:pillow:9.4.0
-
cpe:2.3:a:python:pillow:9.5.0