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.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U N L L 6.5 .0035 28.0 —
AFFECTED Product Versions Fixed langflow < 1.9.0 – —
TIMELINE Apr 30 Reserved by GitHub_M Jun 23 EXPLOIT PUBLISHED — CVE-2026-42867 (langflow-ai langflow). Public exploit reference added. Jun 23 Published (CNA: GitHub_M)
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (POST /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem. This vulnerability is fixed in 1.9.0.
| Date | Event | Detail |
|---|---|---|
| April 30, 2026 | Reserved | Reserved by GitHub_M |
| June 23, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-42867 (langflow-ai langflow). Public exploit reference added. |
| June 23, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| langflow-ai | langflow | — | < 1.9.0 | — |
Authoritative record: CVE-2026-42867 at cve.org
Vendors: langflow-ai
Weaknesses: CWE-22
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-42867 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.