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.

• https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4
• https://github.com/python-pillow/Pillow/pull/10010
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg

• https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4
• https://github.com/python-pillow/Pillow/pull/10010
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg

• MEDIUMCVE-2025-14181PoC
• UNSCOREDCVE-2025-58771
• HIGHCVE-2026-100136
• HIGHCVE-2026-100208
• UNSCOREDCVE-2026-101201
• MEDIUMCVE-2026-101279
• HIGHCVE-2026-101944
• HIGHCVE-2026-101945

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