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                            CERT-Renater

                Note d'Information No. 2026/VULN386
_____________________________________________________________________

DATE                : 14/04/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Acrobat DC, Acrobat Reader DC
                              versions prior to 26.001.21411,
                  Acrobat 2024 versions prior to 24.001.30362 (Windows),
                      24.001.30360 'Mac OS X.

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https://helpx.adobe.com/security/products/acrobat/apsb26-43.html
_____________________________________________________________________


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

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:    

Product   Track   Updated Versions    Platform    Priority Rating
Availability

Acrobat DC   Continuous   26.001.21411   Windows and macOS   1
Release Notes

Acrobat Reader DC   Continuous   26.001.21411   Windows and macOS  1
Release Notes

Acrobat 2024   Classic 2024   Windows: 24.001.30362 | Mac: 24.001.30360
Windows  and macOS   1     Release Notes


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 	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 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.

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