Vulnerability · Published Aug 4, 2026 · Assigned by GitHub_M
CVE-2026-69257Flowise: SSRF Protection Bypass via IPv4-Mapped IPv6 Addresses
High 7.6
In plain English
A high-severity server-side request forgery in Flowise from FlowiseAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | flowise | 3.1.3 | GHSA-c6xh-wv4j-ppv5 |
Affected products (as reported)
Weakness: CWE-918, CWE-1389 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c6xh-wv4j-ppv5 x_refsource_CONFIRM
- https://github.com/FlowiseAI/Flowise/pull/6431 x_refsource_MISC
- https://github.com/FlowiseAI/Flowise/commit/0fc769208395641c1411ccdb9c81416e54802155 x_refsource_MISC
- https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3 x_refsource_MISC