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CVE-2026-64613: CWE-732 Incorrect Permission Assignment for Critical Resource in EGOR Data::Buffer::SharedCVE-2026-64613 0 Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW. The segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached. 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 symlink at the path redirects the open to another file. Join the discussion | CVE Database V5 | 07/21/2026, 19:05:49 UTC Added: 07/21/2026, 19:42:45 UTC |
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