Vulnerability in Pillow Python Imaging Library Allowing Memory Disclosure
CVE-2026-114501

6.3MEDIUM

Key Information:

Vendor

Python-pillow

Status
Pillow
Vendor
CVE Published:
21 October 2026

What is CVE-2026-114501?

The Pillow Python imaging library contains a vulnerability affecting versions from 11.2.1 to 13.0.0. This issue arises during the export of images to Arrow format, where the assumption of tightly contiguous image rows can lead to exposure of uninitialized data or stale memory from previously freed images. As a result, applications that utilize specific alignment configurations may inadvertently disclose user-private pixels or process memory, potentially compromising user privacy and data security. The vulnerability is resolved in version 13.0.0.

Affected Version(s)

Pillow >= 11.2.1, < 13.0.0

References

https://github.com/python-pillow/Pillow/security/advisori...
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https://github.com/python-pillow/Pillow/pull/10172
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https://github.com/python-pillow/Pillow/commit/19f64946eb...
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CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.