CVE-2026-40005 Apache Software Foundation CVE debrief

Who should care

Users of Apache IoTDB versions 1.0.0 through 2.0.9 should upgrade to version 2.0.10 to mitigate this vulnerability. Operators, platform administrators, vulnerability management teams, and security teams should review the affected scope and severity. They should also verify the affected product deployments in managed environments and assign an owner for follow-up.

Technical summary

The CVE-2026-40005 vulnerability is a Path Traversal issue in Apache IoTDB. It allows an attacker to write arbitrary files anywhere the IoTDB process has write permissions using an unsafe API. The vulnerability has a CVSS score of 9.1 and is considered CRITICAL. It affects Apache IoTDB versions from 1.0.0 before 2.0.10. The recommended mitigation is to upgrade to version 2.0.10. The IoTDB process has write permissions with an unsafe API, which can be exploited by an attacker to write arbitrary files.

Defensive priority

High

Recommended defensive actions

• Upgrade Apache IoTDB to version 2.0.10
• Review and restrict write permissions for the IoTDB process
• Monitor for suspicious file writes
• 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 was published on 2026-07-10T08:16:22.043Z and last modified on 2026-07-10T16:16:29.703Z. The NVD entry is currently Deferred. The IoTDB process has write permissions with an unsafe API, which can be exploited by an attacker to write arbitrary files. Evidence is limited, and defenders should verify the affected scope and severity. The CVE record and NVD entry provide official details, but additional verification is recommended.

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.