High severity7.5NVD Advisory· Published Jun 23, 2026· Updated Jun 24, 2026
CVE-2026-55446
CVE-2026-55446
Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
langflowPyPI | < 1.0.19 | 1.0.19 |
Affected products
2cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*range: <1.0.19
- (no CPE)range: <1.0.19
Patches
Vulnerability mechanics
References
4- github.com/langflow-ai/langflow/pull/3923nvdIssue TrackingPatchWEB
- github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9nvdExploitPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-qwqc-p3q8-wcg9ghsaADVISORY
- github.com/langflow-ai/langflow/blob/v1.0.18/src/backend/base/langflow/api/v1/files.pyghsaWEB
News mentions
1- Langflow: Four CVEs Disclosed Together — Two Critical, Including File-Read and IDOR BugsVypr Intelligence · Jun 19, 2026