ET WEB_SPECIFIC_APPS Langflow AI Authenticated Arbitrary File Write via Path Traversal (CVE-2026-33309)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SPECIFIC_APPS Langflow AI Authenticated Arbitrary File Write via Path Traversal (CVE-2026-33309)";
    flow:established,to_server;
    http.uri;
    content:"/api/v2/files/"; fast_pattern; startswith;
    http.content_type;
    content:"multipart/form-data|3b|";
    http.request_body;
    content:"filename|3d 22|";
    pcre:"/^[^\x22]*(?:(?:\x2e|%+(?:25)?2[Ee]|%+(?:25)?32%+(?:25)?[46]5){1,2}(?:\x2f|\x5c|%+(?:25)?(?:25)?5[Cc]|%+(?:25)?2[Ff]){1,}){2,}/R";
    http.method;
    content:"POST";
    reference:url,github.com/langflow-ai/langflow/security/advisories/GHSA-g2j9-7rj2-gm6c;
    reference:cve,2026-33309;
    classtype:web-application-attack;
    sid:2070127; rev:1;
    metadata:affected_product Langflow, attack_target Server, tls_state TLSDecrypt, created_at 2026_07_01, cve CVE_2026_33309, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_01, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)