Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | >= 11.2.1, < 13.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/python-pillow/Pillow/commit/19f64946eb247b973dd4560be7dea3bf9Patch
- https://github.com/python-pillow/Pillow/pull/10172Issue Tracking
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-654x-cwwv-5j9cVendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-654x-cwwv-5j9cVendor Advisory
FAQ
What is CVE-2026-114501?
CVE-2026-114501 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 align...
How severe is CVE-2026-114501?
CVE-2026-114501 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-114501?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.