Memory Management Vulnerability in Pillow Python Imaging Library
CVE-2026-112402

8.7HIGH

Key Information:

Vendor

Python-pillow

Status
Pillow
Vendor
CVE Published:
19 October 2026

What is CVE-2026-112402?

Pillow, a widely-used Python imaging library, exhibits a vulnerability prior to version 13.0.0 where a double free of image memory may occur during specific image transformation operations. This happens in the ImagingScaleAffine method when a selective allocation failure is encountered, primarily affecting cases with Transform.EXTENT or Transform.AFFINE operations using the default NEAREST resampling method. If allocation of the output image succeeds while a per-column lookup allocation fails, an error path is triggered that leads to the unintended deletion of image storage, which can be released again during cleanup. This flaw can be exploited by attackers under memory pressure to execute large Image.transform() operations, potentially causing process crashes and memory corruption. This issue has been resolved in version 13.0.0.

Affected Version(s)

Pillow < 13.0.0

References

https://github.com/python-pillow/Pillow/security/advisori...
x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/commit/aafa6c75f7...
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

.