Adobe Patches Actively Exploited Acrobat Reader Zero-Day CVE-2026-34621 — Exploited Since December 2025
Adobe has issued an emergency patch for CVE-2026-34621 (CVSS 8.6), a prototype pollution zero-day in Acrobat Reader actively exploited since December 2025. Attackers can achieve code execution by delivering maliciously crafted PDF documents via phishing.
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