# CVE-2026-64615: EGOR Data::Graph::Shared insecure file permissions and symlink following

Source: https://junglewise.ai/threats/cve-2026-64615-egor-data-graph-shared-insecure-file-permissions-and-symlink  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-64615 · Severity: info · CVSS 4 · Published 2026-07-21

Data::Graph::Shared is a Perl library used for managing shared data structures. A security flaw in versions before 0.04 allows local users on the same system to read sensitive data stored in these shared structures. Additionally, a local attacker could trick the library into writing data to the wrong location or hijacking the data stream, potentially leading to data theft or corruption.

Vendors: [EGOR Data](https://junglewise.ai/threats/vendors/egor-data).

## Quick answers

**Is CVE-2026-64615 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-64615 being exploited in the wild.

**How severe is CVE-2026-64615?** Informational severity, with a CVSS score of 4, published 21 July 2026.

**Which products and versions are affected?** EGOR Data Graph::Shared < 0.04.

**Is there a fix for CVE-2026-64615?** A patch was published on 2026-07-03: Version 0.04 released with security hardening. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-64615 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-64615?** Check whether you run EGOR Data Graph::Shared at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in graph.h where the open() system call is used with O_RDWR|O_CREAT and a mode of 0666. Due to default umask settings (typically 022), this results in world-readable files (0644) in shared directories like /tmp or /dev/shm, allowing local information disclosure of IPC payloads. Furthermore, the absence of O_NOFOLLOW and O_EXCL flags allows a local attacker to perform a symlink attack or win a race condition to pre-plant a file, potentially redirecting file operations or gaining unauthorized access to the shared memory segment. The issue is fixed in version 0.04 by using mode 0600 and improved file handling.

## Affected products

- EGOR Data::Graph::Shared < 0.04

## Timeline

- 2026-07-03: patched: Version 0.04 released with security hardening.
- 2026-07-21: disclosed: CVE-2026-64615 published.

## References

- [https://cpan.org/modules](https://cpan.org/modules)
- [https://metacpan.org/release/EGOR/Data-Graph-Shared-0.04/changes](https://metacpan.org/release/EGOR/Data-Graph-Shared-0.04/changes)
- [https://metacpan.org/release/EGOR/Data-Graph-Shared-0.04/diff/EGOR/Data-Graph-Shared-0.03](https://metacpan.org/release/EGOR/Data-Graph-Shared-0.04/diff/EGOR/Data-Graph-Shared-0.03)