Notice USN-8839-1, published on September 28, 2026 in the Ubuntu security feed, describes vulnerabilities in the Atril document viewer. The feed’s translation says that a specially crafted PDF could exploit improper handling of command-line arguments in /GoToR actions and lead to arbitrary code execution (CVE-2026-46529).
The notice also reports that incorrect handling of certain PDFs could cause denial of service or code execution (CVE-2019-1010006). This flaw is stated to be limited to Ubuntu 16.04 LTS. Another flaw, in processing certain images, could expose confidential information and is also limited to that Ubuntu version (CVE-2019-11459).
To protect yourself, consult the original USN-8839-1 notice through Ubuntu’s official security channel and check its details and update guidance for the system version in use. Avoid opening PDFs from untrusted sources and keep the system and applications updated; do not assume the flaws limited to Ubuntu 16.04 apply to other versions.
If you use AI to summarize the notice or prepare internal procedures, share only the necessary content and remove personal data or confidential information. Verify the technical conclusions against the original notice: this summary does not replace checking the affected version or applying recommended updates.