Adobe Acrobat Reader Zero-Day CVE-2026-34621 Remained Undetected on VirusTotal for 136 Days

A zero-day vulnerability in Adobe Acrobat Reader, later assigned CVE-2026-34621, was uploaded to VirusTotal 136 days prior to Adobe officially recognizing and assigning it a CVE identifier. The vulnerability was publicly accessible on the platform during this period, highlighting a significant gap between the public availability of the exploit and its formal acknowledgment by the vendor.