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Adobe Reader fails to validate rejected file attachments

CVE-2026-27034
Summary

Using Adobe Reader to open a file that was previously rejected due to a security concern can lead to the file being opened without restrictions. This could allow an attacker to exploit the previously identified vulnerability. To protect yourself, ensure that you do not open files from untrusted sources, and use the latest version of Adobe Reader.

Original title
Rejected reason: Not used
Original description
Rejected reason: Not used
Published: 18 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026