Adobe Releases Emergency Patch for Critical Reader Zero-Day Exploited in the Wild
Adobe has issued emergency patches for a critical zero-day vulnerability in Acrobat and Reader, identified as CVE-2026-34621, which has been exploited for several months. The flaw allows for arbitrary code execution and affects both Windows and macOS versions. The vulnerability was discovered by Haifei Li, a researcher known for his work in cybersecurity. The exploit involves sophisticated PDF files and has been linked to advanced persistent threat (APT) activities, with indications of Russian-language lures related to the oil and gas sector.