Observed Signal · Mar 27, 2026 · Security Vulnerability & Exploitation · Source: DEV Community · Impact: 3/5 · Sentiment: Negative
Langflow RCE Exploited Within 20 Hours
A critical remote code execution (RCE) vulnerability (CVE-2026-33017, CVSS 9.3) in Langflow was actively exploited within 20 hours of the public advisory. The flaw allowed unauthenticated HTTP POST requests to /api/v1/build_public_tmp/{flow_id}/flow to submit attacker-supplied flow definitions that contained arbitrary Python code executed via exec() with no sandboxing, yielding full server-level code execution. Attackers used the advisory as an informal proof-of-concept to build exploits and harvest secrets, API keys and credentials; downstream supply-chain compromises were observed. A prior critical RCE (CVE-2025-3248, CVSS 9.8) shared the same root cause on a different endpoint. The developer patch in dev version 1.9.0.dev8 removes the data parameter from the public endpoint; affected Langflow versions are ≤ 1.8.1. The article frames this as part of a broader pattern of rapid exploitation across AI infrastructure and recommends runtime behavior monitoring (e.g., ClawMoat).
High-severity RCEs in AI infrastructure that are exploitable within hours change attacker timelines and threaten enterprise AI pipelines and downstream supply chains; the incident signals a recurring pattern across AI tooling and raises operational-security requirements.
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Key Takeaways & Evidence Grounding
- CVE-2026-33017 is a critical Langflow RCE (CVSS 9.3) exploitable via an unauthenticated POST to /api/v1/build_public_tmp/{flow_id}/flow.
- Active exploitation began within 20 hours of the public advisory; no public PoC existed prior to exploitation.
- The vulnerability stems from accepting a data parameter with attacker-supplied flow definitions that are passed to exec() with zero sandboxing.
- Affected Langflow versions: ≤ 1.8.1; developer patch available in 1.9.0.dev8 which removes the data parameter from the public endpoint.
- CVE-2025-3248 (CVSS 9.8) was an earlier RCE in Langflow with the same root cause on a different endpoint and is on CISA's Known Exploited Vulnerabilities list.
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