PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-65063 EGOR CVE debrief

Data::RadixTree::Shared versions before 0.02 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The segment is created in radix.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 allows local attackers to access IPC payloads stored in the world-readable segment.

Vendor
EGOR
Product
Data::RadixTree::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::RadixTree::Shared versions before 0.02 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, vulnerability-management, and security teams should review official advisories and plan vendor-supported updates or mitigations.

Technical summary

The Data::RadixTree::Shared module for Perl creates a world-readable mmap backing file due to a missing O_EXCL and O_NOFOLLOW flags when opening the file. This allows local users to access the IPC payloads stored in the segment and potentially redirect the open to a pre-planted file or symlink. A local attacker can exploit this vulnerability to access sensitive information. The vulnerability arises from the open function in radix.h being called with mode 0666, which results in a world-readable file being created with permissions 0644 under the default umask 022. To mitigate this, users should update to version 0.02 or later of Data::RadixTree::Shared and ensure the use of O_EXCL and O_NOFOLLOW flags when opening the mmap backing file.

Defensive priority

High

Recommended defensive actions

  • Update to version 0.02 or later of Data::RadixTree::Shared
  • Use O_EXCL and O_NOFOLLOW flags when opening the mmap backing file
  • Monitor for suspicious activity related to the /tmp or /dev/shm directories
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • 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

Evidence notes

The CVE record was published on 2026-07-21T20:17:05.313Z and has not been modified since then. 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 track exceptions.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-21T20:17:05.313Z and has not been modified since then. The NVD entry is currently Deferred.