EGOR Data::NDArray::Shared up to 0.1 ndarray.h open path toctou

Summaryinfo

A vulnerability classified as problematic was found in EGOR Data::NDArray::Shared up to 0.1. This impacts the function Open of the file ndarray.h of the component Shared. Such manipulation of the argument path leads to toctou. This vulnerability is listed as CVE-2026-64616. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in EGOR Data::NDArray::Shared up to 0.1 and classified as problematic. Affected by this issue is the function open of the file ndarray.h of the component Shared. The manipulation of the argument path with an unknown input leads to a toctou vulnerability. Using CWE to declare the problem leads to CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at metacpan.org. This vulnerability is handled as CVE-2026-64616 since 07/20/2026. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 0.02 eliminates this vulnerability.

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Productinfo

Vendor

• EGOR

Name

• Data::NDArray::Shared

Version

• 0.1

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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