CVE-2026-96641

Pillow is a Python imaging library. Prior to 13.0.0, PILfont text-width accumulation in src/_imaging.c checks positive glyph advances against INT_MAX but does not check negative advances against INT_MIN. Repeating a signed 16-bit advance of -32768 can therefore execute a signed C integer overflow in xsize += dx, producing a large positive width from a negative mathematical result. Applications that use getlength(), getsize(), or derived layout, quota, serialization, or allocation calculations can experience logic-integrity errors or resource consumption, while the high-level mask path commonly retains a decompression-bomb check. This issue is fixed in version 13.0.0.

• CWE-190

• https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4Patch
• https://github.com/python-pillow/Pillow/pull/10010Issue Tracking
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0Release Notes
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fgVendor Advisory

Published

Oct 21, 2026

Last Modified

Oct 28, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-96628Arcane is an interface for managing Docker containers, image…4.3
• CVE-2026-96636Pillow is a Python imaging library. Prior to 13.0.0, MpoImag…6.5
• CVE-2026-96637Pillow is a Python imaging library. Prior to 13.0.0, SpiderI…6.5
• CVE-2026-96638Pillow is a Python imaging library. From 9.1.0 until 13.0.0,…6.5
• CVE-2026-96639Pillow is a Python imaging library. From 11.0.0 until 13.0.0…9.8
• CVE-2026-96640Pillow is a Python imaging library. From 5.1.0 until 13.0.0,…7.5
• CVE-2026-96642Pillow is a Python imaging library. Prior to 13.0.0, the Tar…6.5
• CVE-2026-96643Pillow is a Python imaging library. From 11.0.0 until 13.0.0…6.5
• CVE-2026-96644Pillow is a Python imaging library. Prior to 13.0.0 on Windo…8.1
• CVE-2026-96647The Listdom: AI-powered Business Directory with Classifieds …6.4
• CVE-2026-96648The Data Tables Generator by Supsystic plugin for WordPress …6.4
• CVE-2026-96649The Frontend Post Submission Manager Lite – Frontend Posting…7.2