CVE-2026-88340 VirusTotal CVE debrief

Who should care

Defenders and security teams responsible for YARA deployments, especially those handling .yrc rule files, should assess exposure and prioritize verification of deserialization processes.

Why it matters

Defenders should prioritize verifying YARA 4.5.8 deserialization processes, especially in environments handling .yrc rule files, due to the risk of memory corruption and application crashes from invalid pointer release.

• Potential memory corruption and application crashes due to invalid pointer release.
• Possible wild pointer access leading to unpredictable behavior.
• Need for verification of YARA deserialization processes in .yrc file handling.
• Potential for attackers to provide specially crafted .yrc files for exploitation.

Technical summary

An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files due to insufficient validation of external-variable pointers, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create(). The vulnerability is caused by insufficient validation of external-variable pointers during deserialization of compiled .yrc rule files. An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash. Defenders should prioritize verifying YARA 4.5.8 deserialization processes, especially in environments handling .yrc rule files, and assess exposure to potential memory corruption and application

Defensive priority

Defenders should prioritize verifying YARA 4.5.8 deserialization processes, especially in environments handling .yrc rule files, and assess exposure to potential memory corruption and application crashes.

Recommended defensive actions

• Verify YARA 4.5.8 deserialization processes, especially in environments handling .yrc rule files.
• Assess exposure to potential memory corruption and application crashes.
• Implement compensating controls to monitor and limit .yrc file processing.
• Review and update YARA configurations to ensure secure deserialization.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The vulnerability is caused by insufficient validation of external-variable pointers during deserialization of compiled .yrc rule files, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create().

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.