SB2026041109 - Remote code execution in Adobe Acrobat and Reader
Published: April 11, 2026
Security Bulletin ID
SB2026041109
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Prototype pollution (CVE-ID: CVE-2026-34621)
CWE-ID: CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes (\'Prototype Pollution\')
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
The vulnerability allows a remote attacker to execute arbitrary JavaScript code.
The vulnerability exists due to improper input validation when handling PDF files. A remote attacker can trick the victim into opening a specially crafted PDF file and execute arbitrary code on the system.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.