CVE-2026-64616: CWE-732 Incorrect Permission Assignment for Critical Resource in EGOR Data::NDArray::Shared
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.
AI Analysis
Technical Summary
CVE-2026-64616 describes a vulnerability in Data::NDArray::Shared versions prior to 0.02 where the mmap backing file is created with mode 0666 (resulting in 0644 after umask), making it world-readable. The file is opened without O_EXCL or O_NOFOLLOW flags, allowing an attacker to exploit race conditions by pre-creating files or symlinks at the mmap path. This leads to exposure of IPC payloads to local users due to incorrect permission assignment (CWE-732) and unsafe symbolic link following (CWE-59).
Potential Impact
The vulnerability allows local users to read sensitive IPC data stored in the shared memory segment due to world-readable permissions. Additionally, attackers can exploit race conditions by pre-creating files or symlinks at the mmap path, potentially redirecting the open operation. The impact is limited to confidentiality loss of IPC payloads with no integrity or availability impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should avoid running vulnerable versions in multi-user environments or restrict access to the shared directory to trusted users only. Monitoring for updates from the vendor or CPAN security advisories is recommended.
CVE-2026-64616: CWE-732 Incorrect Permission Assignment for Critical Resource in EGOR Data::NDArray::Shared
Description
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.
CVSS v3.1
Score 3.3low
Affected software
pkg:github/Data-NDArray-SharedRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-64616 describes a vulnerability in Data::NDArray::Shared versions prior to 0.02 where the mmap backing file is created with mode 0666 (resulting in 0644 after umask), making it world-readable. The file is opened without O_EXCL or O_NOFOLLOW flags, allowing an attacker to exploit race conditions by pre-creating files or symlinks at the mmap path. This leads to exposure of IPC payloads to local users due to incorrect permission assignment (CWE-732) and unsafe symbolic link following (CWE-59).
Potential Impact
The vulnerability allows local users to read sensitive IPC data stored in the shared memory segment due to world-readable permissions. Additionally, attackers can exploit race conditions by pre-creating files or symlinks at the mmap path, potentially redirecting the open operation. The impact is limited to confidentiality loss of IPC payloads with no integrity or availability impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should avoid running vulnerable versions in multi-user environments or restrict access to the shared directory to trusted users only. Monitoring for updates from the vendor or CPAN security advisories is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CPANSec
- Date Reserved
- 2026-07-20T11:30:10.287Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5fcbb72a4a8d5989ac73a0
Added to database: 07/21/2026, 19:42:47 UTC
Last enriched: 07/30/2026, 21:28:14 UTC
Last updated: 08/26/2026, 10:52:10 UTC
Views: 29
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