CVE-2026-65069

MediumCVSS 4.0

Published: 21/07/2026(UTC)Updated: 23/07/2026(UTC)Translated: 25/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.16%

6th percentile - higher than 6% of all known CVEs

Summary

Data::DisjointSet::Shared before version 0.02 for Perl creates a world-readable mmap backing file (mode 0644) and opens it without O_EXCL or O_NOFOLLOW. A local attacker can read IPC data or use a symlink to redirect the open.

Risk Assessment

A local user can access IPC data of other processes, compromising confidentiality and integrity of inter-process communication.

Recommendation

Update the Data::DisjointSet::Shared module to version 0.02 or later.

Other vulnerabilities in Data::DisjointSet::Shared

CVE-2026-59147Critical
Vulnerability in Data::DisjointSet::Shared for Perl before version 0.02 allows out-of-bounds reads and writes via an unvalidated parent index in dsu_find. The dsu_validate_header checks header scalars and region layout against file size but does not validate the array contents. A local attacker with write access to the backing file can poison the parent array, leading to out-of-bounds memory access.

Original NVD description (English source)

Data::DisjointSet::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 dsu.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.