CVE-2026-96638

Pillow is a Python imaging library.

• Severity: Medium
• CVSS 6.5
• EPSS 0.28%
• P4 · Track

Why P4: track.

Description

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 products

• pip pillow >= 9.1.0, < 13.0.0; first patched: 13.0.0

Weakness

• CWE-400
• CWE-770

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

• NVD record NVD
• CVE Program record CVE Program
• Reference NVD
• Reference NVD
• Reference NVD
• Reference NVD
• GitHub security advisory GitHub

Published 2026-10-21 · updated 2026-10-22 · sources: NVD, GitHub Advisory Database