CVE-2026-34621

Published Apr 11, 2026

Last updated a month ago

Zero-day

Acrobat Reader

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-34621 is a 'Prototype Pollution' vulnerability affecting Adobe Acrobat Reader versions 24.001.30356, 26.001.21367, and earlier, including Acrobat DC and Acrobat 2024. This flaw, categorized as an Improperly Controlled Modification of Object Prototype Attributes, could enable arbitrary code execution within the context of the current user. Successful exploitation of this vulnerability can lead to unauthorized access to sensitive data, unauthorized data modifications, and disruption of system operations. Exploitation of CVE-2026-34621 requires user interaction, specifically that a victim opens a malicious file. Reports indicate that this vulnerability has been actively exploited in the wild since at least December 2025, with some sources noting that no user interaction beyond simply opening a malicious PDF document is necessary for an attack to succeed. Adobe has released emergency updates to address this issue.

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.
Source: psirt@adobe.com
NVD status: Analyzed
Products: acrobat_dc, acrobat_reader_dc, acrobat

Risk scores

CVSS 3.1

Type: Secondary
Base score: 8.6
Impact score: 6
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Severity: HIGH

Known exploits

Data from CISA

Vulnerability name: Adobe Acrobat and Reader Prototype Pollution Vulnerability
Exploit added on: Apr 13, 2026
Exploit action due: Apr 27, 2026
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.

Weaknesses

psirt@adobe.com: CWE-1321

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.