CVE-2026-78654 cleverbrush CVE debrief

Who should care

Defenders of systems using the cleverbrush framework and deep up to version 4.4.0 should assess exposure and prioritize upgrading to version 4.4.1. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and update affected components.

Why it matters

CVE-2026-78654 vulnerability in cleverbrush framework and deep up to 4.4.0 allows for improperly controlled modification of object prototype attributes, with remote exploitation possible. Defenders should prioritize upgrading to version 4.4.1.

• Remote exploitation is possible
• Improperly controlled modification of object prototype attributes can lead to security issues
• Upgrade to version 4.4.1 and apply patch 810398c1308c500c3b8b6af380b5a89371389327 to fix the issue

Technical summary

The vulnerability affects the deepExtend function in libs/deep/src/deepExtend.ts of the cleverbrush framework and deep up to version 4.4.0, allowing for improperly controlled modification of object prototype attributes. This issue allows for remote exploitation, and defenders should prioritize upgrading to version 4.4.1 with patch 810398c1308c500c3b8b6af380b5a89371389327 to fix the issue. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. The CVE record was published on 2026-08-25T06:19:01.940Z and has not been modified since then.

Defensive priority

Upgrade to version 4.4.1 and apply patch 810398c1308c500c3b8b6af380b5a89371389327.

Recommended defensive actions

• Upgrade to version 4.4.1
• Apply patch 810398c1308c500c3b8b6af380b5a89371389327
• Review and update affected components
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, affected version, and fixed version. The vulnerability affects the deepExtend function in libs/deep/src/deepExtend.ts of the cleverbrush framework and deep up to version 4.4.0. Remote exploitation is possible, allowing for improperly controlled modification of object prototype attributes. Defenders should verify affected product deployments and prioritize upgrading to version 4.4.1.

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.