CVE-2026-64617

Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O EXCL or O NOFOLLOW.

The segment is created in pubsub.h with open(path, O RDWR|O CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O NOFOLLOW is absent, so a symlink planted at the path is followed, and O EXCL is absent, so the open silently uses a pre-planted file instead of failing.

A "Shared" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted file or symlink at the path lets a local attacker win a pre-creation race or redirect the open.