CVE-2026-110715 Artifex Software CVE debrief

Who should care

Defenders responsible for systems and applications using MuJS 1.3.6 before 1.3.9 should assess potential exposure and impact, and prioritize updating to version 1.3.9 or later. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review system and application configurations, check for MuJS 1.3.6 before 1.3.9 usage, and monitor for potential anomalies. Additionally, they should plan for vendor-sup

Why it matters

CVE-2026-110715 is a medium-severity vulnerability in MuJS 1.3.6 before 1.3.9, allowing for heap out-of-bounds read and write via Array.prototype.sort. Defenders should prioritize verifying exposure, assessing potential impact, and updating to version 1.3.9 or later.

• Potential memory corruption and process crashes
• Possible data integrity issues
• Required verification of exposure and impact
• Necessity to update MuJS to version 1.3.9 or later

Technical summary

The vulnerability is a heap out-of-bounds read and write issue in MuJS 1.3.6 before 1.3.9, specifically in the Array.prototype.sort method. This allows attackers to corrupt memory by manipulating array lengths. The issue arises from inadequate handling of array lengths during sorting, enabling attackers to access and modify memory outside the buffer. To address this vulnerability, defenders should focus on updating to version 1.3.9 or later and enhancing monitoring and detection capabilities. The technical details of the vulnerability

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, focusing on systems and applications using MuJS 1.3.6 before 1.3.9.

Recommended defensive actions

• Verify MuJS version and assess exposure
• Review and update MuJS to version 1.3.9 or later
• Monitor systems and applications using MuJS for potential impact
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, additional information on exploitation and impact is limited. Defenders should verify exposure and assess potential impact by reviewing system and application configurations, checking for MuJS 1.3.6 before 1.3.9 usage, and monitoring for potential anomalies. The lack of detailed information on exploitation and impact necessitates a cautious approach, focusing on updating to version 1.3.9 or later and enhancing

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.