CVE-2026-105740langflow OS Command Injection
Langflow: Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server
Published Oct 5, 2026 · Updated Oct 8, 2026 · Also known as EUVD-2026-92799
Key Facts
Patch immediately- CVE-2026-105740 is a critical-severity vulnerability (CVSS 9.9 v3.1) affecting langflow.
- It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 11, 2026. A public exploit is reported by tracking sources, but no code link is listed yet.
- EPSS estimates a 0.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including langflow 1.9.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
0.6%
Higher than 47.1% of all scored CVEs
Exploit maturity
None known
ATLAS score
27/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 11, 2026
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
None known
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, any authenticated Langflow user can achieve Remote Code Execution (RCE) on the server by adding an MCP server with the "Stdio" transport. The user-supplied command field is passed directly to bash -c "exec {command}" with zero validation, no allowlisting, and no sandboxing.
The command executes immediately when the server list is fetched. Additionally, the env field allows arbitrary environment variable injection (e.g., LD_PRELOAD, PATH override). This vulnerability is fixed in 1.9.0.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | Oct 11, 2026 | n/a | Not reported |
| Industry KEV feed | Oct 11, 2026 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| langflow | >= < 1.9.0 | 1.9.0 |
Patched Releases
langflow
1.9.0
Timeline
Publicly disclosed
Oct 5, 2026
Last updated
Oct 8, 2026
Added to CIRCL KEV
Oct 11, 2026
Added to Industry KEV feed
Oct 11, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisorycve.org · CVERecord
- advisorynvd.nist.gov · CVE-2026-105740
- exploitVulnCheck exploitation report
- otherhttps://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0
- otherhttps://github.com/langflow-ai/langflow/pull/12290
FAQ
Common Questions.
Langflow is a tool for building and deploying AI-powered agents and workflows.
Affected: langflow versions >= < 1.9.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 11, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
A public exploit is reported by tracking sources, but no code link is listed yet.
Fixed versions are available, including langflow 1.9.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2026-105740 On Your Attack Surface?
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