CVE-2026-65061 EGOR CVE debrief

Who should care

Users of Data::ReqRep::Shared versions before 0.05 for Perl should be aware of this vulnerability. The vulnerability allows local users to read sensitive data, potentially leading to information disclosure. Affected operators, platforms, and security teams should review the vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by the creation of a world-readable mmap backing file in reqrep.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. This can lead to information disclosure, as any local user can read the IPC payloads stored in the world-readable segment.

Defensive priority

High

Recommended defensive actions

• Update to version 0.05 or later
• Use O_EXCL and O_NOFOLLOW when opening the file
• Restrict access to the file using file system permissions
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-21T20:17:05.030Z and has not been modified since then. The NVD entry is currently Deferred. There is limited information available about this vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability allows local users to read sensitive data, potentially leading to information disclosure. The package creates a world-readable mmap backing file and opens it without O_EXCL or O_NOFOLLOW, which can be exploited by a local attacker to win a pre-creation race or redirect the open.

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.