CVE-2026-34621

Adobe Acrobat and Reader Prototype Pollution Vulnerability

CVE-2026-34621 is fixed in 2 products on 1 platform, first by Adobe Acrobat Reader DC 26.001.21411, released April 10, 2026. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on April 13, 2026. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

8.6

No vendor severity

Exploitation

Exploited

Reported by the vendor

CISA KEV

Apr 13, 2026

Federal due date Apr 27, 2026

EPSS

0.0734

94th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Adobe Acrobat Reader DC	26.001.21411	Adobe Acrobat Reader DC 26.001.21411	Apr 10, 2026
Adobe Acrobat Reader DC (64-bit)	26.001.21411	Adobe Acrobat Reader DC (64-bit) 26.001.21411	Apr 10, 2026

Details

Published
April 11, 2026
Weakness
CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
CISA 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.
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34621

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