CVE-2026-65069 EGOR CVE debrief

Who should care

Users of Data::DisjointSet::Shared versions before 0.02 for Perl should be aware of this vulnerability and take steps to mitigate it. Affected operators include users of Perl and Data::DisjointSet::Shared. Platform impact includes local information disclosure. Vulnerability management and security teams should review and prioritize remediation.

Technical summary

The vulnerability is caused by the creation of a world-readable mmap backing file in dsu.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created with mode 0644 (world-readable). The absence of O_NOFOLLOW allows a symlink planted at the path to be followed, and the absence of O_EXCL allows the open to silently use a pre-planted file instead of failing. Affected product context includes Data::DisjointSet::Shared versions before 0.02 for Perl. Defensive impact includes local information disclosure.

Defensive priority

High

Recommended defensive actions

• Update to version 0.02 or later
• Use proper permissions when creating mmap backing files
• Monitor for suspicious activity
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Review and prioritize remediation based on asset inventory

Evidence notes

The CVE record was published on 2026-07-21T20:17:05.940Z and last modified on 2026-07-22T16:21:53.517Z. The NVD entry is currently Deferred. Evidence is limited to public CVE and NVD information. Defenders should verify affected product deployments, review official advisories, and plan updates or mitigations. Monitoring and compensating controls are recommended while remediation is scheduled.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.