Bulletin ID
Last updated on
Apr 11, 2026
Security update available for Adobe Acrobat Reader | APSB26-43
|
|
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
For questions regarding Acrobat DC, please visit the Acrobat DC FAQ page.
For questions regarding Acrobat Reader DC, please visit the Acrobat Reader DC FAQ page.
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:
|
Track |
Updated Versions |
Platform |
Priority Rating |
Availability |
|
|
Acrobat DC |
Continuous |
26.001.21411 |
Windows and macOS |
1 |
|
|
Acrobat Reader DC |
Continuous |
26.001.21411 |
Windows and macOS |
1 |
|
|
Acrobat 2024 |
Classic 2024 |
Windows: 24.001.30362 | Mac: 24.001.30360 |
Windows and macOS |
1 |
Vulnerability Details
| Vulnerability Category | Vulnerability Impact | Severity | CVSS base score | CVSS vector | CVE Number |
| Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321) | Arbitrary code execution | Critical | 9.6 | CVSS:3.1/AV:N/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
NOTE: Adobe has a public bug bounty program with HackerOne. If you are interested in working with Adobe as an external security researcher, please check out https://hackerone.com/adobe
For more information, visit https://helpx.adobe.com/security.html, or email PSIRT@adobe.com.
