CVE-2026-34621

CRITICAL CVSS 3.1: 8.6 EPSS 7.09% ACTIVE EXPLOIT
Updated Aug 28, 2026
Adobe

CISA Known Exploited Vulnerability (KEV)

This vulnerability is actively exploited in the wild. Immediate patching is strongly recommended.

Due Date: Apr 27, 2026

Parameter Value
CVSS 8.6 (CRITICAL)
Affected Versions 24.0.0 — 26.001.21411
Fixed In 26.001.21411
Type CWE-1321 (Prototype Pollution)
Vendor Adobe
Public PoC Yes

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 8

Configuration From (including) Up to (excluding)
Adobe Acrobat_Dc
cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*
26.001.21411
Adobe Acrobat_Reader_Dc
cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*
26.001.21411
Apple Macos
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
Microsoft Windows
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Adobe Acrobat
cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*
24.0.0 24.001.30362
Microsoft Windows
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Adobe Acrobat
cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*
24.0.0 24.001.30360
Apple Macos
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*