Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Is CVE-2026-34621 exploited?
Listed in the CISA KEV catalog on 2026-04-13.
Federal remediation due 2026-04-27.
Past that date by 110 days.
EPSS puts exploitation in the next 30 days at 7%.
Public exploit code: none found in monitored sources.