CVE-2026-64617
LowCVSS 3.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
Vulnerability in Data::PubSub::Shared for Perl before version 0.07 creates a world-readable mmap backing file and opens it without O_EXCL and O_NOFOLLOW flags. This allows a local attacker to read IPC data and exploit a race condition or symlink.
Risk Assessment
The organization is at risk of confidential IPC data leakage and file replacement by a local attacker, potentially compromising system integrity.
Recommendation
Update Data::PubSub::Shared to version 0.07 or later. Restrict access to shared directories such as /tmp and /dev/shm.
Original NVD description (English source)
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.