Memory Denial of Service Vulnerability in Pillow Python Imaging Library
CVE-2026-112399

8.7HIGH

Key Information:

Vendor

Python-pillow

Status
Pillow
Vendor
CVE Published:
19 October 2026

What is CVE-2026-112399?

The Pillow Python imaging library, in versions from 8.1.0 to 12.0.0, contains a vulnerability that permits a crafted Animated Portable Network Graphics (APNG) image to exhaust memory resources. This occurs when an APNG with an initial small frame and a disproportionately large canvas is processed, leading to significant memory allocation without loading actual pixel data. When the Image.open() function attempts to position to frame zero, it inadvertently performs a full-canvas allocation, which can result in a denial of service. The issue has been resolved in version 13.0.0.

Affected Version(s)

Pillow >= 8.1.0, < 13.0.0

References

https://github.com/python-pillow/Pillow/security/advisori...
x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/commit/f1acfc54c5...
x_refsource_MISC
https://github.com/python-pillow/Pillow/releases/tag/13.0.0
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.