VulnerabilityBleeping Computer
9.8 — CRITICAL
Path traversal flaw in AI dev platform Langflow exploited in attacks
Attackers are actively exploiting CVE-2026-5027, a high-severity path traversal vulnerability in the AI development platform Langflow, to write arbitrary files on exposed servers. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
Attackers are exploiting a high-severity path traversal vulnerability in Langflow's file upload functionality, allowing them to write arbitrary files on exposed servers, with over 7,000 publicly exposed instances detected.
⚙️Technical Details
CVEs
CVE-2026-5027CVE-2026-0770CVE-2026-21445CVE-2026-33017CVE-2025-3248Affected Systems: Langflow instancesAttack Vectors: NETWORK
Affected Systems
Langflow instances
Attack Vectors
NETWORK
💥Impact Assessment
Severity: CRITICAL
Who Is at Risk
Users of Langflow, particularly those with unauthenticated auto-login enabled by default.
🛡️Recommended Actions
1Upgrade to the latest release (version 1.10.0) as soon as possible
2Enable authentication for all API endpoints and restrict access to sensitive user conversation data, transaction histories, etc.
3Regularly scan for vulnerabilities using tools like Censys
📦Affected Products
Langflow LangflowLangflow
🔐NVD Verified DataVERIFIED
CVE-2026-5027 ↗CVSS 8.8 — HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-22
CVE-2026-0770 ↗CVSS 9.8 — CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-829
Affected Products (CPE)
Langflow Langflow
CVE-2026-21445 ↗CVSS 9.1 — CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeaknesses
CWE-306
Affected Products (CPE)
Langflow Langflow
CVE-2026-33017 ↗CVSS 9.8 — CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-306CWE-94CWE-95
Affected Products (CPE)
Langflow Langflow
CVE-2025-3248 ↗CVSS 9.8 — CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeaknesses
CWE-306CWE-94
Affected Products (CPE)
Langflow Langflow
Patches & References
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