CVE-2026-55446 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-55446HIGH

langflow-ai langflow — Langflow: Unauthenticated DoS through multipart form boundary file upload

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0035   27.9     —

AFFECTED
  Product   Versions    Fixed
  langflow  < 1.0.19 –  —

TIMELINE
  Jun 16  Reserved by GitHub_M
  Jun 23  EXPLOIT PUBLISHED — CVE-2026-55446 (langflow-ai langflow). Public exploit reference added.
  Jun 23  Published (CNA: GitHub_M)

CWE-400 · CNA: GitHub_M · CVSS v3.1 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 16, 2026	Reserved	Reserved by GitHub_M
June 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55446 (langflow-ai langflow). Public exploit reference added.
June 23, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
langflow-ai	langflow	—	< 1.0.19	—

Weaknesses

CWE-400

References (2)

https://github.com/langflow-ai/langflow/pull/3923 [Issue Tracking, Patch]
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 [Exploit, Patch, Vendor Advisory]

Authoritative record: CVE-2026-55446 at cve.org

Vendors: langflow-ai

Weaknesses: CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55446 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.