🛡️ CVE-2026-64613

🟡 CVSS 6.2 — Medium ✅ No Known Exploit CWE-59 NVD
6.2
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-64613 is classified as CWE-59: Link Following. The software follows symbolic or hard links without verifying their target, so a planted link can redirect an operation to a sensitive file.

Affected software

CVE-2026-64613 is recorded against 1 package.

  • unknown

Timeline and source

Published on 21 July 2026 and last revised on 23 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

metacpan.org
metacpan.org

Details

Severity MEDIUM
CVSS Score 6.2
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-59
Public Exploit ✅ No
Source NVD
Published 2026-07-21
Updated 2026-08-11
Modified 2026-07-23
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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