CVE-2026-107167 Red Hat CVE debrief

Who should care

Defenders responsible for systems relying on m17n-lib for input processing should assess exposure and prioritize patching or mitigating this vulnerability. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal (

Why it matters

This vulnerability in m17n-lib can lead to a Denial of Service (DoS) or potentially allow arbitrary code execution. Defenders responsible for systems relying on m17n-lib for input processing should assess exposure and prioritize patching or mitigating this vulnerability. The issue requires verification of affected versions and remediation status, as well as monitoring for potential exploitation attempts.

• Potential Denial of Service (DoS) due to application crashes
• Potential arbitrary code execution if exploitation is successful
• Need for verification of affected versions and remediation status
• Importance of monitoring for potential exploitation attempts

Technical summary

The m17n-lib library is vulnerable to a heap use-after-free condition. This occurs when the library frees an internal input context object but subsequently attempts to write to that freed memory. The issue can be triggered by providing specially crafted text input during input-method state transitions. The vulnerability can lead to a Denial of Service (DoS) or potentially allow arbitrary code execution. Defenders should prioritize patching or mitigating this vulnerability, especially in systems relying on m17n-lib for input processing.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in systems relying on m17n-lib for input processing.

Recommended defensive actions

• Assess exposure of systems relying on m17n-lib for input processing
• Prioritize patching or mitigating this vulnerability
• Monitor for potential Denial of Service (DoS) or arbitrary code execution attempts
• 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 Program and NVD provide official records of this vulnerability. Red Hat has also provided information on affected products. Defenders should verify the affected scope, severity, and vendor guidance. The vulnerability has been publicly disclosed, and its details are available in the CVE record and NVD vulnerability detail page. There may be additional information available from other sources, and defenders should review these sources to ensure they have a comprehensive understanding of the vulnerability.

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.