Server-Side Request Forgery (SSRF) in Flowise - CVE-2026-69257
Published: July 30, 2026
Vulnerability identifier: #VU140075
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69257
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to access internal services and disclose sensitive information.
The vulnerability exists due to incorrect normalization of IPv4-mapped IPv6 addresses in the http security module when validating resolved host addresses against the deny list. A remote user can control DNS resolution for a hostname and provide a crafted AAAA record to access internal services and disclose sensitive information.
The issue affects IPv4-mapped IPv6 addresses such as ::ffff:127.0.0.1 and ::ffff:169.254.169.254, causing IPv4 CIDR deny rules to be skipped because of an ipv6 versus ipv4 kind mismatch.
Affected software
Flowise
How to mitigate CVE-2026-69257
Install security update from vendor's website.
Flowise - update to 3.1.3