# CVE-2026-65069: EGOR Data::DisjointSet::Shared insecure file permissions and symlink following

Source: https://junglewise.ai/threats/cve-2026-65069-egor-data-disjointset-shared-insecure-file-permissions-and  
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-2026-65069 · Severity: info · CVSS 0 · Published 2026-07-21

Data::DisjointSet::Shared is a Perl library used for managing shared data structures across different processes. A security flaw in versions before 0.02 allows local users on the same system to read sensitive data stored in these shared memory segments. Additionally, a local attacker could trick the library into using a malicious file, potentially leading to data corruption or unauthorized access to information.

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

## Quick answers

**Is CVE-2026-65069 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-65069 being exploited in the wild.

**How severe is CVE-2026-65069?** Informational severity, with a CVSS score of 0, published 21 July 2026.

**Which products and versions are affected?** EGOR Data DisjointSet::Shared < 0.02.

**Is there a fix for CVE-2026-65069?** A patch was published on 2026-07-03: Version 0.02 released with security hardening. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-65069 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-65069?** Check whether you run EGOR Data DisjointSet::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 stems from insecure file operations in dsu.h. Specifically, the library uses open() with mode 0666, which results in world-readable files (0644) under default umask settings. Furthermore, the absence of O_EXCL and O_NOFOLLOW flags allows a local attacker to perform symlink attacks or win a race condition by pre-planting a file in shared directories like /tmp or /dev/shm. This enables unauthorized reading of IPC payloads or redirection of the memory-mapped file to an attacker-controlled location. The issue is resolved in version 0.02, which implements mode 0600 by default.

## Affected products

- EGOR Data::DisjointSet::Shared < 0.02

## Timeline

- 2026-07-03: patched: Version 0.02 released with security hardening.
- 2026-07-21: disclosed: CVE-2026-65069 published.

## References

- [https://cpan.org/modules](https://cpan.org/modules)
- [https://metacpan.org/release/EGOR/Data-DisjointSet-Shared-0.02/changes](https://metacpan.org/release/EGOR/Data-DisjointSet-Shared-0.02/changes)
- [https://metacpan.org/release/EGOR/Data-DisjointSet-Shared-0.02/diff/EGOR/Data-DisjointSet-Shared-0.01](https://metacpan.org/release/EGOR/Data-DisjointSet-Shared-0.02/diff/EGOR/Data-DisjointSet-Shared-0.01)