Help Net Security

Acrobat Reader zero-day exploited in the wild for many months (CVE-2026-34621)

Unknown attackers have exploited a zero-day Adobe Acrobat Reader vulnerability since November 2025 and possibly even earlier, security researcher Haifei Li has discovered. Haifei Li is one of the ...
Help Net Security

Adobe issues emergency fix for Acrobat Reader flaw exploited in the wild (CVE-2026-34621)

CVE-2026-34621 is a critical prototype pollution vulnerability – a type of vulnerability that occurs in JavaScript and allows attackers to add or modify an application’s JavaScript objects and ...