CVE-2026-59140: Egor Data::sortedset::shared

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Egor Data::sortedset::shared: before 0.03 (fixed in 0.03)

Published 2026-07-21. Last modified 2026-07-22.