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CVE-2026-64614 EGOR CVE debrief

Data::Deque::Shared versions before 0.06 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in deque.h with open(path, O_RDWR|O_CREAT, 0666). 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. This vulnerability allows local attackers to access IPC payloads stored in the world-readable segment.

Vendor
EGOR
Product
Data::Deque::Shared
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-22
Advisory published
2026-07-21
Advisory updated
2026-07-22

Who should care

Users of Data::Deque::Shared versions before 0.06 for Perl should be aware of this vulnerability, as it allows local attackers to access IPC payloads stored in the world-readable segment. Affected operators, platforms, and security teams should review the vulnerability and take necessary actions to mitigate the risk.

Technical summary

The Data::Deque::Shared module for Perl creates a world-readable mmap backing file due to a missing O_EXCL and O_NOFOLLOW flag when opening the file. This allows local attackers to access the IPC payloads stored in the segment. The vulnerability affects Data::Deque::Shared versions before 0.06 for Perl. The module creates a shared segment in a shared directory such as /tmp or /dev/shm, which can be accessed by any local user.

Defensive priority

High

Recommended defensive actions

  • Update to version 0.06 or later of Data::Deque::Shared
  • Verify file permissions and access controls
  • Monitor for suspicious activity
  • 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 2026-07-21T20:17:04.070Z 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 CVE record does not provide specific details about the vulnerability, but it is related to the Data::Deque::Shared module for Perl.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-21T20:17:04.070Z and has not been modified since then.