CVE-2026-34621
Prototype Pollution in Adobe Acrobat and Reader. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 13 April 2026.
- Product
- Adobe Acrobat and Reader
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution.
More from Adobe this year.
- CVE-2026-48356 Unrestricted Upload of File with Dangerous Type, added
- CVE-2026-71362 Incorrect Authorization, added
- CVE-2026-75650 Improper Neutralization of Special Elements Used in a Template Engine, added
- CVE-2026-48282 Path Traversal, added
- CVE-2009-3459 Heap-Based Buffer Overflow, added
- CVE-2020-9715 Use-After-Free, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.