Mmastodon TechnologyCybersecurity first seen 2 d ago, last 2 d ago, peak #12

Critical heap buffer overflow flaw found in Pillow TIFF handling

Original: 🚨 EUVD-2026-104603 📊 Score: 9.2/10 (CVSS v3.1) 📦 Product: Pillow 🏢 Vendor: python-pillow 📅 Updated: 2026-10-21 📝 Pillow:

A high-severity vulnerability, EUVD-2026-104603, has been catalogued in Pillow, the widely used Python image library. The flaw, scored 9.2 out of 10 under CVSS v3.1, is a heap buffer overflow in the _tiffWriteProc function, triggered when saving TIFF images to a BytesIO stream. Security teams are being urged to review the advisory and check whether their applications use the affected code path.

Why now: Pillow is one of the most widely deployed Python imaging libraries, so a critical vulnerability in it raises immediate patching concerns across many projects.

Pillowpython-pillowENISA

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Evidence

• 🚨 EUVD-2026-104603 📊 Score: 9.2/10 (CVSS v3.1) 📦 Product: Pillow 🏢 Vendor: python-pillow 📅 Updated: 2026-10-21 📝 Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO 🔗 https:// euvd.enisa.europa.eu/vulnerabi lity/EUVD-2026-104603 # cybersecurity # infosec… · EUVD_Bot

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