CVE-2026-34621: Adobe Acrobat and Reader Prototype Pollution Vulnerability

High severity, CVSS 8.6. Actively exploited: in CISA KEV since 2026-04-13. EPSS: 2.2% chance of exploitation in the next 30 days.

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.

Affected products

• Adobe Acrobat: from 24.0.0, before 24.001.30362 (fixed in 24.001.30362); from 24.0.0, before 24.001.30360 (fixed in 24.001.30360)
• Adobe Acrobat DC: before 26.001.21411 (fixed in 26.001.21411)
• Adobe Acrobat Reader DC: before 26.001.21411 (fixed in 26.001.21411)

Published 2026-04-11. Last modified 2026-08-28.