CVE-2026-14470: 
Homebrew vulnerability analysis and mitigation

CVE-2026-14470 is a path traversal vulnerability in IBM Langflow OSS that allows authenticated attackers to read arbitrary files on the system by sending specially crafted URL requests containing "dot dot" sequences (/../). It affects IBM Langflow OSS versions 1.0.0 through 1.10.2, with the fix introduced in version 1.10.3. The vulnerability was published on September 4, 2026, and carries a CVSS v3.1 base score of 6.5 (Medium) (GitHub Advisory, IBM Advisory).

The vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory — Path Traversal), arising from insufficient sanitization of user-supplied URL input before it is used to construct file system paths. An authenticated attacker can craft HTTP requests embedding /../ sequences to escape the intended directory boundary and access files outside the restricted directory. Exploitation requires only low privileges (a valid authenticated session) and no user interaction, making it straightforward to leverage once credentials are obtained. No public proof-of-concept code has been identified at this time (GitHub Advisory, IBM Advisory).

Successful exploitation allows any authenticated user to read arbitrary files on the underlying server, resulting in a high confidentiality impact. Sensitive data such as configuration files, credentials, API keys, or application secrets stored on the file system could be exposed. There is no integrity or availability impact, but file disclosure could facilitate further attacks such as credential theft or lateral movement (GitHub Advisory, IBM Advisory).

No public proof-of-concept exploit code exists, and there is no evidence of active in-the-wild exploitation as of the time of disclosure (GitHub Advisory). The EPSS score is approximately 0.328% (26th percentile), indicating a low near-term probability of exploitation. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been reported.

1. Authentication: Obtain valid credentials for an IBM Langflow OSS instance running versions 1.0.0 through 1.10.2 (e.g., via phishing, credential stuffing, or insider access).
2. Reconnaissance: Identify the target's file system structure by probing common paths (e.g., /etc/passwd on Linux, application config files) to understand the directory layout.
3. Craft malicious URL: Construct a URL request embedding path traversal sequences such as /../../../etc/passwd or /../../../app/config.yaml in the relevant URL parameter or endpoint.
4. Send request: Submit the crafted HTTP GET request to the vulnerable Langflow OSS endpoint while authenticated, bypassing directory restrictions due to insufficient input sanitization.
5. Retrieve file contents: The server returns the contents of the targeted file, exposing sensitive data such as credentials, API keys, or system configuration (GitHub Advisory, IBM Advisory).

• Network: HTTP requests to Langflow OSS endpoints containing URL-encoded or literal /../ sequences (e.g., %2F..%2F, /../) in URL parameters; unusual GET requests targeting paths outside the application's expected directory scope.
• Logs: Web server or application access logs showing requests with traversal patterns such as ../../etc/passwd or similar sequences; repeated 200 OK responses to requests with abnormal path components from a single authenticated user.
• File System: No direct file system artifacts are expected from read-only exploitation, but evidence of accessed sensitive files (e.g., audit logs showing reads of /etc/passwd, config files, or credential stores) may be present if OS-level auditing is enabled.
• Process: No unusual process behavior expected for a read-only path traversal; however, subsequent attacker activity using harvested credentials may manifest as new authenticated sessions or lateral movement attempts.

IBM has released a fix in Langflow OSS version 1.10.3; users should upgrade immediately from any version in the 1.0.0–1.10.2 range (IBM Advisory, GitHub Advisory). As interim mitigations, implement input validation to sanitize and reject directory traversal sequences (e.g., /../, %2F..%2F) in all URL parameters. Deploy web application firewall (WAF) rules to block requests containing "dot dot" sequences. Additionally, restrict the file system permissions of the Langflow OSS service account to the minimum necessary directories to limit the blast radius if exploitation occurs.