Langflow Code Injection Vulnerability (CVE-2026-33017)

Historical catalog analysis: CISA added this entry on March 25, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2026-33017 is a code injection vulnerability identified in Langflow. The flaw allows for the construction of public flows without requiring authentication. This exposure is categorized under CWE-94, CWE-95, and CWE-306, indicating failures in authentication and improper neutralization of special elements used in commands.

Exposure and applicability

This vulnerability affects organizations deploying Langflow as an AI orchestration tool. The primary risk is the ability for unauthenticated actors to inject code via the creation of public flows. Infrastructure owners should identify all instances of Langflow within their environment, including those deployed as cloud services or on-premises installations, to determine if they are running versions susceptible to this injection path.

Remediation priorities

Based on our analysis, defenders should prioritize the following actions to reduce exposure:

1. Apply Vendor Mitigations: The primary corrective action is to implement mitigations as specified in the vendor’s security advisories. This is the most direct method to address the underlying code injection flaw.
2. Review Cloud Service Configurations: For organizations utilizing Langflow via cloud providers, we recommend reviewing configurations in alignment with BOD 22-01 guidance to ensure that exposure is minimized at the platform level.
3. Evaluate Product Viability: In scenarios where vendor mitigations cannot be applied or are unavailable for a specific deployment, the source suggests discontinuing use of the product as a risk reduction measure.

How to validate remediation

Verification must move beyond simple version checks, as a deployed patch does not inherently guarantee that the environment is secure. To verify that exposure has been reduced, vulnerability management teams should:

• Confirm Mitigation Application: Document the successful application of vendor-supplied fixes across all identified assets.
• Test Authentication Requirements: Verify that the creation of public flows now strictly requires authentication and that unauthenticated requests to build flows are rejected.
• Validate Input Handling: Ensure that inputs used in flow construction no longer allow for the injection of unauthorized code.

Limits and open questions

It remains unknown whether this vulnerability has been leveraged by ransomware campaigns. Additionally, while CISA has established a remediation deadline of 2026-04-08 for federal agencies, this date is not a universal mandate for non-federal organizations. Residual risk may persist if compensating controls are used instead of direct patches, or if the environment contains legacy configurations that bypass new authentication requirements.

Source and editorial note

CVE-2026-33017: Langflow Code Injection Vulnerability · Source date: March 25, 2026 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: March 28, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 16, 2026 at 00:32 UTC.

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