CVE-2026-34621
Published 2026-04-11 · Updated 2026-08-28 · Source psirt@adobe.com
Description
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.
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Adobe — Acrobat and Reader
Name: Adobe Acrobat and Reader Prototype Pollution Vulnerability
Date added: 2026-04-13 · Due: 2026-04-27
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.