Prototype pollution in Adobe Acrobat and Adobe Reader - CVE-2026-34621
Published: April 11, 2026
Vulnerability identifier: #VU125813
CSH Severity: Critical
CVSS v4.0: 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
CVE-ID: CVE-2026-34621
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Adobe
Affected software:
Adobe Acrobat
Adobe Reader
Adobe Acrobat
Adobe Reader
Detailed vulnerability description
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.
How to mitigate CVE-2026-34621
Install updates from vendor's website.