SB2026080520 - Multiple vulnerabilities in Langflow

Description

This security bulletin contains information about 2 vulnerabilities.

1) Code Injection (CVE-ID: N/A)

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the prompt injection issue in the Smart Transform component. A remote user can execute arbitrary code on the target system.

2) Authentication Bypass by Spoofing (CVE-ID: N/A)

CWE-ID: CWE-290 - Authentication Bypass by Spoofing

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to overwrite MCP client configuration files on the server and bypass a local-only access restriction.

The vulnerability exists due to authentication bypass by spoofing in the MCP configuration installation endpoint (`POST /api/v1/mcp/project/{project_id}/install`) and `get_client_ip` helper when handling requests with a spoofed `X-Forwarded-For` header. A remote user can send a specially crafted request with `X-Forwarded-For: 127.0.0.1` to overwrite MCP client configuration files on the server and bypass a local-only access restriction.

The write target is limited to a fixed set of per-OS developer tool configuration files resolved by the application rather than an attacker-supplied arbitrary path.

Remediation

Install update from vendor's website.

References

• https://github.com/langflow-ai/langflow/security/advisories/GHSA-9fpm-3445-2vx4
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82