FlowiseAI Flowise up to 3.1.2 HTTP Security httpSecurity.ts isDeniedIP incomplete blacklist

Summaryinfo

A vulnerability labeled as critical has been found in FlowiseAI Flowise up to 3.1.2. This impacts the function isDeniedIP of the file httpSecurity.ts of the component HTTP Security Module. The manipulation results in incomplete blacklist. This vulnerability was named CVE-2026-69257. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in FlowiseAI Flowise up to 3.1.2. Affected is the function isDeniedIP of the file httpSecurity.ts of the component HTTP Security Module. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. CWE is classifying the issue as CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-69257 since 08/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1562.006 by the MITRE ATT&CK project.

Upgrading to version 3.1.3 eliminates this vulnerability.

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Productinfo

Vendor

• FlowiseAI

Name

• Flowise

Version

• 3.1.0
• 3.1.1
• 3.1.2

Website

• Product: https://github.com/FlowiseAI/Flowise/

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