CVE-2026-40516 HKUDS CVE debrief

Who should care

This vulnerability affects users of OpenHarness, particularly those who use the web_fetch and web_search tools. It is recommended that users take immediate action to mitigate this vulnerability by applying the patch provided by the vendor and restricting access to the affected tools.

Technical summary

The vulnerability is caused by a lack of proper validation of target addresses in the web_fetch and web_search tools of OpenHarness. This allows attackers to manipulate tool parameters and access private and localhost HTTP services. The vulnerability has a high CVSS score of 7.8, indicating a high level of severity. Affected product deployments should be identified and owners assigned for follow-up. Official advisories and CVE records should be reviewed to validate affected scope, severity, and vendor guidance.

Defensive priority

High

Recommended defensive actions

• Apply the patch provided by the vendor
• Restrict access to the web_fetch and web_search tools
• Monitor for suspicious activity
• Implement additional security measures to protect against SSRF attacks
• 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 vulnerability was reported by an unknown researcher and was patched by the vendor. The patch is available on GitHub. Further verification is recommended to confirm affected scope and severity. Evidence limits suggest that additional information may be available but has not been disclosed. Defenders should verify the patch and review system logs for potential exploitation.

Official resources