CVE-2026-69257 FlowiseAI CVE debrief

Who should care

Flowise users and administrators should assess their exposure and update to version 3.1.3 or later. Roles responsible for system configuration, security, and network management should verify IP restrictions and deny lists are properly configured and up-to-date.

Why it matters

CVE-2026-69257 is a high-severity vulnerability in Flowise that allows an attacker to bypass IP restrictions and potentially access sensitive endpoints. Flowise users and administrators should assess their exposure and update to version 3.1.3 or later. The vulnerability requires verification of IP restrictions and deny lists, and assessment of DNS resolution controls.

• Potential bypass of IP restrictions
• Possible access to localhost, internal services, or cloud metadata endpoints
• Requires verification of IP restrictions and deny lists
• Needs assessment of DNS resolution controls

Technical summary

The Flowise HTTP security module did not properly normalize IPv4-mapped IPv6 addresses before checking them against the deny list. This issue allows an attacker who controls DNS resolution for certain hostnames to bypass IP restrictions and potentially reach localhost, internal services, or cloud metadata endpoints. The vulnerability requires verification of IP restrictions and deny lists, and assessment of DNS resolution controls. An attacker could return a AAAA record for an IPv4-mapped target and cause requests to reach localhost, internal services, or cloud metadata endpoints.

Defensive priority

High

Recommended defensive actions

• Review and update Flowise to version 3.1.3 or later
• Assess and restrict DNS resolution for hostnames used by the HTTP Node, API Chain, Document Loader, MCP tool, or other paths using secureAxiosRequest(), secureFetch(), or checkDenyList()
• Verify IP restrictions and deny lists are properly configured and up-to-date
• 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 in Flowise versions prior to 3.1.3, where the HTTP security module did not properly normalize IPv4-mapped IPv6 addresses before checking them against the deny list. This issue allows an attacker who controls DNS resolution for certain hostnames to bypass IP restrictions and potentially reach localhost, internal services, or cloud metadata endpoints.

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.