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For questions regarding Acrobat Reader DC, please visit the Acrobat Reader DC FAQ page.
Adobe Security Bulletin
Last updated on Apr 12, 2026
Security update available for Adobe Acrobat Reader | APSB26-43
Bulletin ID
Date published
Priority
APSB26-43
April 11, 2026
1
Summary
Adobe has released a security update for Adobe Acrobat and Reader for Windows and macOS. This update addresses a critical vulnerability. Successful exploitation could lead to arbitrary code execution.
Adobe is aware of CVE-2026-34621 being exploited in the wild.
Affected versions
Product
Track
Affected versions
Platform
Acrobat DC
Continuous
26.001.21367 and earlier
Windows & macOS
Acrobat Reader DC
Continuous
26.001.21367 and earlier
Windows & macOS
Acrobat 2024
Classic 2024
24.001.30356 and earlier
Windows & macOS
Solution
Adobe recommends users update their software installations to the latest versions by following the instructions below.
The latest product versions are available to end users via one of the following methods:
- Users can update their product installations manually by choosing Help > Check for Updates.
- The products will update automatically, without requiring user intervention, when updates are detected.
- The full Acrobat Reader installer can be downloaded from the Acrobat Reader Download Center.
For IT administrators (managed environments):
- Refer to the specific release note version for links to installers.
- Install updates via your preferred methodology, such as AIP-GPO, bootstrapper, SCUP/SCCM (Windows), or on macOS, Apple Remote Desktop and SSH.
Adobe categorizes these updates with the following priority ratings and recommends users update their installation to the newest version:
Product
Track
Updated versions
Platform
Priority rating
Availability
Vulnerability Details
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Arbitrary code execution
Critical
8.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVE-2026-34621
Acknowledgements
Adobe would like to thank the following researchers for reporting these issues and for working with Adobe to help protect our customers:
- Haifei Li (EXPMON) - CVE-2026-34621
Revisions
- April 12, 2026: Adjusted CVSS Attack Vector from Network (AV:N) to Local (AV:L), changing the overall CVSS from 9.6 to 8.6.
NOTE: Adobe has a public bug bounty program. If you are interested in working with Adobe as an external security researcher, please check out https://app.intigriti.com/programs/adobe/adobepublic/detail
For more information, visit https://www.adobe.com/trust/security/bug-bounty.html, or email PSIRT@adobe.com.
CardTitle
APSB26-43
CardDescription
Priority 1 Security update
CardImage
Created
2026-04-11
Tags
caas:content-type/documentation,caas:trust-center/security-bulletin,caas:products/acrobat
PrimaryTag
caas:content-type/article
Details
caas:mnemonics/acrobat
Arbitrary
search: CVE-2026-34621
