Memory Exhaustion in Pillow Python Imaging Library Due to GIF Frame Handling
CVE-2026-112400

8.7HIGH

Key Information:

Vendor

Python-pillow

Status
Pillow
Vendor
CVE Published:
19 October 2026

What is CVE-2026-112400?

The Pillow library, widely used for image processing in Python, contains a vulnerability where it fails to clear rejected GIF frame sizes following a decompression-bomb exception. This occurs in the GifImageFile._seek method, allowing crafted GIF files to retain erroneous dimensions. If an application handles this exception but continues to process the image, it may lead to excessive memory allocation during subsequent seek or load operations, potentially resulting in a denial of service. The issue has been resolved in Pillow version 13.0.0.

Affected Version(s)

Pillow >= 9.2.0, < 13.0.0

References

https://github.com/python-pillow/Pillow/security/advisori...
x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/commit/6faed707cf...
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

.