Pillow is a Python imaging library. Prior to 13.0.0, Pillow's ImageMorph.MorphOp.apply() can access memory before a row buffer for a zero-width image. PPM and PGM input can create an image with width zero, and the native morphology routine indexes outrow[width - 1] without rejecting that geometry. An attacker can supply such an image to an application that applies a morphology operation. This can crash the process. This issue is fixed in version 13.0.0.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/python-pillow/Pillow/commit/18f7c0dfee93063c51db6ed0ca8c4da2999dcb64 Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-58r4-6rv3-gfh8 Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-58r4-6rv3-gfh8 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 5
- Cpes+1 CPE criteria (now 1)NVD modified 2026-10-27 21:00
- StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-27 21:00
- StatusPublished → Undergoing AnalysisNVD modified 2026-10-20 19:48
- StatusReceived → PublishedNVD modified 2026-10-19 21:38
- First seenCVSS 8.7NVD modified 2026-10-19 22:17
Affected (CPE criteria) 1
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
References 4
- https://github.com/python-pillow/Pillow/commit/18f7c0dfee93063c51db6ed0ca8c4da2999dcb64 Patch
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-58r4-6rv3-gfh8 Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-58r4-6rv3-gfh8 Exploit, Vendor Advisory