CVE-2026-69257

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise's HTTP security module httpSecurity.ts did not normalize IPv4-mapped IPv6 addresses such as ::ffff:127.0.0.1 and ::ffff:169.254.169.254 before checking them against the deny list. Because ipaddr.js reports these addresses as ipv6 while IPv4 CIDR deny-list entries are ipv4, isDeniedIP() skipped the IPv4 CIDR checks. An attacker who controls DNS resolution for a hostname used by the HTTP Node, API Chain, Document Loader, MCP tool, or other paths using secureAxiosRequest(), secureFetch(), or checkDenyList() could return a AAAA record for an IPv4-mapped target and cause requests to reach localhost, internal services, or cloud metadata endpoints. This issue is fixed in version 3.1.3.

• CWE-918
• CWE-1389

• https://github.com/FlowiseAI/Flowise/commit/0fc769208395641c1411ccdb9c81416e54802155Patch
• https://github.com/FlowiseAI/Flowise/pull/6431Issue Tracking, Patch
• https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3Patch, Release Notes
• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c6xh-wv4j-ppv5Exploit, Mitigation, Vendor Advisory
• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c6xh-wv4j-ppv5Exploit, Mitigation, Vendor Advisory

Published

Aug 4, 2026

Last Modified

Sep 14, 2026

Status

Analyzed

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