Security readout for executives and security teams
Plain-English summary
Langflow versions before 1.8.0 can let an unauthenticated attacker turn a CSV Agent prompt into server-side code execution. If Langflow is reachable by users or the internet, this can threaten the host’s data, integrity, and availability. The vendor advisory says version 1.8.0 fixes the issue.
Executive priority
Treat as urgent for any reachable Langflow deployment. Remote code execution can enable full server compromise. Prioritize upgrade and exposure review ahead of routine maintenance for affected systems.
Technical view
CVE-2026-27966 affects Langflow < 1.8.0. The CSV Agent node hardcoded LangChain’s dangerous code execution path, exposing the Python REPL tool. Prompt injection could execute arbitrary Python and OS commands on the Langflow server. The CVSS 3.1 score is 9.8, mapped to CWE-94.
Likely exposure
Highest concern is any Langflow deployment before 1.8.0 using or exposing the CSV Agent node, especially network-accessible instances. The source bundle does not identify specific deployment defaults, cloud services, or authentication configurations.
Exploitation context
The advisory describes unauthenticated, network-reachable remote code execution with low attack complexity and no user interaction. CISA KEV status is false in the provided data, and no cited source confirms active exploitation.
Researcher notes
Evidence is strong for affected version range, root cause, and fixed version based on the GitHub advisory and commit. The provided sources do not include proof-of-concept details, observed exploitation, or additional compensating controls beyond upgrading/checking vendor guidance.
Mitigation direction
- Upgrade Langflow to version 1.8.0 or later.
- Inventory Langflow instances and identify versions below 1.8.0.
- Restrict access to Langflow until upgraded, especially from untrusted networks.
- Review vendor advisory and commit for any environment-specific guidance.
Validation and detection
- Confirm installed Langflow version is 1.8.0 or later.
- Check whether CSV Agent workflows exist in deployed projects.
- Verify Langflow is not exposed to untrusted networks unnecessarily.
- Review recent Langflow server activity for suspicious execution or access patterns.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27966 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4CVE reference · x_refsource_CONFIRM
- https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.