CVE-2026-64616
LowCVSS 3.3Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
Vulnerability in Data::NDArray::Shared for Perl before version 0.02. The mmap backing file is created with mode 0666, resulting in 0644 (world-readable) under default umask 022. Missing O_EXCL and O_NOFOLLOW flags allow a local attacker to follow a symlink or replace the file before creation.
Risk Assessment
A local user can read IPC data stored in the shared segment, leading to information disclosure. An attacker can also pre-plant the segment, potentially manipulating data.
Recommendation
Update Data::NDArray::Shared to version 0.02 or later. If not possible, restrict access to /tmp and /dev/shm directories for untrusted users.
Original NVD description (English source)
Data::NDArray::Shared versions before 0.02 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in ndarray.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.