CVE-2026-65063
Received Received - Intake

Insecure File Permissions in Data::RadixTree::Shared Perl Module

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: CPANSec

Description
Data::RadixTree::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 radix.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.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-22
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-65063
EUVD
EUVD-2026-46376

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-732 The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
CWE-59 The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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Executive Summary

This vulnerability affects the Perl module Data::RadixTree::Shared before version 0.02. It creates a world-readable file in shared directories like /tmp or /dev/shm using a mode of 0666, which becomes 0644 under default umask settings. The file is opened without O_EXCL or O_NOFOLLOW flags, allowing attackers to exploit symlink or pre-creation race conditions to read sensitive IPC payloads.

Detection Guidance

Check for world-readable files in shared directories like /tmp or /dev/shm with names related to RadixTree or Data::RadixTree::Shared. Look for files with mode 0644 or similar permissions. Use commands like 'find /tmp -type f -perm 0644 -ls' or 'ls -la /tmp | grep radix' to identify suspicious files.

Impact Analysis

An attacker with local access could read sensitive data stored in the shared memory segment, including IPC payloads. This could lead to information disclosure, privilege escalation, or further attacks if the exposed data contains credentials or other secrets.

Compliance Impact

This vulnerability could violate GDPR's data protection principles by exposing personal data in shared memory. For HIPAA, it may compromise protected health information if stored in the affected segment. Compliance failures could result in legal penalties or data breach notifications.

Mitigation Strategies

Update Data::RadixTree::Shared to version 0.02 or later. Remove any existing files in shared directories that match the vulnerable pattern. Set stricter permissions on shared directories like /tmp or /dev/shm to prevent unauthorized access.

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