EUVD-2026-40401
GHSA-w636-w53p-5frh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Unauthenticated and network-reachable (AV:N/PR:N), but scope is limited to build-event data and per-job cancellation for a known job ID, so C:L and A:L rather than High.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Lifecycle Timeline
6DescriptionNVD
IBM Langflow OSS 1.0.0 through 1.9.6 contains a missing authentication vulnerability in /api/v1/build_public_tmp/ endpoints that allows an unauthenticated attacker to read build event data or cancel jobs using a valid job identifier, resulting in information disclosure and denial of service.
AnalysisAI
Information disclosure and denial of service in IBM Langflow OSS 1.0.0 through 1.9.6 stem from missing authentication on the /api/v1/build_public_tmp/ endpoints, letting an unauthenticated attacker who supplies a valid job identifier read build event data or cancel running jobs. The flaw carries a CVSS 9.1 (AV:N/AC:L/PR:N/UI:N) and CWE-287 classification; there is no public exploit identified at time of analysis, and EPSS is low at 0.25% (17th percentile) with CISA SSVC recording no observed exploitation but flagging it as automatable.
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Recommended ActionAI
Within 24 hours: Identify all Langflow 1.0.0-1.9.6 deployments (especially internet-facing); restrict network access to /api/v1/build_public_tmp/ endpoints to internal/VPN-only via firewall or WAF rules; inventory active jobs and build data classifications. …
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Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
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