Vulnerability Description
Data::SortedSet::Shared versions before 0.03 for Perl allow an out-of-bounds read via unvalidated node indices in the rank and min/max query paths. The attach-time validator ss_validate_header bounds only the root index against the node pool (node_capacity). The order-statistics and min/max queries then follow children[], leftmost and rightmost node indices read raw from the mmap'd segment without bounding them against node_capacity. A full structural check (ss_validate_tree) exists but runs only via an explicit validate method, not on attach. A local peer that can write the backing file can leave the header valid while poisoning the tree links, so the next rank, min or max query dereferences an out-of-bounds node index, reading adjacent memory or crashing the process.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://metacpan.org/release/EGOR/Data-SortedSet-Shared-0.03/changes
- https://metacpan.org/release/EGOR/Data-SortedSet-Shared-0.03/diff/EGOR/Data-Sort
FAQ
What is CVE-2026-59140?
CVE-2026-59140 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Data::SortedSet::Shared versions before 0.03 for Perl allow an out-of-bounds read via unvalidated node indices in the rank and min/max query paths. The attach-time validator ss_validate_header bounds...
How severe is CVE-2026-59140?
CVE-2026-59140 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-59140?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.