EGOR Data::ReqRep::Shared up to 0.04 reqrep.h open path toctou

Summaryinfo

A vulnerability, which was classified as problematic, was found in EGOR Data::ReqRep::Shared up to 0.04. Affected by this vulnerability is the function Open of the file reqrep.h. Executing a manipulation of the argument path can lead to toctou. This vulnerability is registered as CVE-2026-65061. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability was found in EGOR Data::ReqRep::Shared up to 0.04. It has been declared as problematic. This vulnerability affects the function open of the file reqrep.h. The manipulation of the argument path with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Data::ReqRep::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in reqrep.h with open(path, O_RDWR | O_CREAT, 0666), for both the request-reply and the integer-variant segments. 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 shared for download at metacpan.org. This vulnerability was named CVE-2026-65061 since 07/21/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 0.05 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• EGOR

Name

• Data::ReqRep::Shared

Version

• 0.04

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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