CVE-2026-59143 EGOR CVE debrief

Who should care

Users of Data::RoaringBitmap::Shared Perl versions before 0.02 should be aware of this vulnerability and take steps to mitigate it. This vulnerability requires local access to the system and can result in reading adjacent memory or crashing the process. Operators, platform administrators, vulnerability management teams, and security teams should review the official advisory and take necessary actions to protect their systems.

Technical summary

The vulnerability exists in the rb_contains_locked function of Data::RoaringBitmap::Shared Perl versions before 0.02. The function forms a container pointer as pool + container_off * 8192 from a raw file-stored offset and then searches over a file-stored cardinality, neither bounded against the container pool capacity or the fixed 8192-byte slot size. This allows a local attacker to read adjacent memory or crash the process by manipulating the container offset and cardinality.

Defensive priority

High

Recommended defensive actions

• Update to version 0.02 or later of Data::RoaringBitmap::Shared Perl
• Restrict access to the system to prevent local attackers
• Monitor for suspicious activity on the system
• 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 2026-07-21T20:17:03.083Z 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 details on known or unknown affected systems, so defenders should review the official advisory for more information.

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.