CVE-2026-114501: python-pillow pillow

Vulnerability summary

CVE-2026-114501 is a medium (CVSS 6.3) vulnerability in python-pillow pillow.

Timeline

1. 21-10-2026
   PublishedVulnerability first disclosed.

Description

Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im->blocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user's pixels or other process memory to another user. This issue is fixed in version 13.0.0.

• CWE-226Sensitive Information in Resource Not Removed Before ReuseThe product releases a resource such as memory or a file so that it can be made available for reuse, but it does not clear or "zeroize" the information contained in the resource before the product performs a critical state transition or makes the resource available for reuse by other entities.
• CWE-908Use of Uninitialized ResourceThe product uses or accesses a resource that has not been initialized.