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.
CVE-2026-105740
CRITICALPre-NVD 9.99.9—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (46th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.9Exploit: Elevated riskExposed services: Not assessed
The CVE record names the fixed release — apply it.
- CVSS v3
- 9.9
- EG Score
- 9.9CRITICALmedium confidence
- EG Risk
- 61EG Risk 61/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity99% × 45%Exploitation40% × 40%Automatability0% × 15%CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.6%
- EPSS %ILE
- 46th
- KEV
- Not listed
CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.
The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 5, 2026
Last Modified
October 6, 2026
Advisory Details (4)
Auto-updated Oct 6, 2026🔬 Proof of concept available. Fix named in the CVE record. Sources: github_commit, github_pr, github.
githubMentions a patch (unverified)🟡 PoC Available
Langflow < 1.10.3: OS command injection (RCE) via arbitrary command in MCP stdio server configuration · Advisory · langflow-ai/langflow · GitHub
https://github.com/langflow-ai/langflow/security/advisories/GHSA-w794-rj3p-xv45githubMentions a patch (unverified)🟡 PoC Available
Authenticated RCE via MCP Stdio transport allows any user to execute arbitrary OS commands on the server · Advisory · langflow-ai/langflow · GitHub
https://github.com/langflow-ai/langflow/security/advisories/GHSA-7w94-79vh-5mr2github_pr
fix: prevent MCP command injection via allowlist validation (CWE-78)
Fix merged in langflow-ai/langflow PR #12290 on 2026-03-27 — awaiting tagged release
https://github.com/langflow-ai/langflow/pull/12290github_commit
commit efbc4a16e639 (langflow-ai/langflow)
Fix landed in langflow-ai/langflow commit efbc4a16e639 — awaiting tagged release
https://github.com/langflow-ai/langflow/commit/efbc4a16e639409d938a4883463d27ef0bc637a0Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-06 19:37 UTCEG score recompute
- 2026-10-06 18:42 UTCEG score recompute
- 2026-10-06 15:23 UTCEG score recompute
- 2026-10-06 15:17 UTCEPSS rescore
- 2026-10-05 21:22 UTCEG score recompute
- 2026-10-05 21:08 UTCEG score recompute
- 2026-10-05 21:05 UTCMITRE cvelistV5first tracked
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Frequently asked(5)
What is CVE-2026-105740?
CVE-2026-105740 is a critical vulnerability published on October 5, 2026. 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…
When was CVE-2026-105740 disclosed?
CVE-2026-105740 was first published on October 5, 2026, with the most recent update on October 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-105740 actively exploited?
CVE-2026-105740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-105740?
CVE-2026-105740 has a CVSS base score of 9.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-105740?
The CVE record for CVE-2026-105740 names the fix: "This vulnerability is fixed in 1.9.0."
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-105740
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