HOMEVULNERABILITIESCVE-2026-42867
MEDIUM

CVE-2026-42867

CWE-22Published: June 23, 2026· Updated: Jun 26, 2026

6.5
CVSS v3.1
EPSS:0.28%probability of exploitation in 30 daysPercentile:19.9th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-42867 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected Vendors & Products

langflow1 product
langflow
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/langflow-ai/langflow/pull/12337
ADVISORYhttps://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq
ADVISORYhttps://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxq

All References (3)

→
https://github.com/langflow-ai/langflow/pull/12337Patch · Issue Tracking
→
https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxqExploit · Vendor Advisory
→
https://github.com/langflow-ai/langflow/security/advisories/GHSA-79ph-745m-6wxqExploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-42867
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-22
CISA KEVNo
EPSS (30d)0.28%
Affected1 vendor
PublishedJun 23, 2026

Related CVEs (CWE-22)

CVE-2026-2731
10.0
CVE-2026-11414
10.0
CVE-2026-41211
10.0
CVE-2026-34909
KEV10.0
CVE-2026-11420
10.0
CVE-2026-22557
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-42867 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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