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CVE-2026-10561 critical CVSS 10.0

Code Injection in langlow (CVE-2026-10561)

Summary

Code injection in langlow (CVE-2026-10561). Successful exploitation can lead to full system takeover. Exploitable via PythonREPLComponent. Mitigation: upgrade to 1.10.1 or later.

Original description

The description as published by the source.

Summary

Langflow's built-in Python interpreter components — PythonREPLComponent (Python Interpreter) and the legacy PythonREPLToolComponent (Python REPL Tool) — executed arbitrary user- or model-supplied Python code inside flows without effective sandboxing. Because the code ran in-process with the privileges of the Langflow service, any authenticated user who could edit and run a flow could achieve remote code execution and, from there, escalate privileges to superuser (e.g. by opening a database session and flipping is_superuser) or compromise the host.

This issue is fixed as of 1.10.1, with additional hardening through 1.12.3. See Remediation below.

Affected

  • Package: langflow (PyPI), and the underlying lfx package that ships the component.
  • Vulnerable versions: < 1.10.1.
  • Patched: 1.10.1 (core fix). Upgrade to >= 1.12.3 for the complete hardening series.

Details

The root cause is code injection (CWE-94/CWE-95): the component passed raw input to LangChain's PythonREPL, which is explicitly not a security sandbox.

Two distinct weaknesses existed before 1.10.1:

  1. Unrestricted builtins (default deployments). get_globals() built the exec globals from the global_imports allow-list but never set __builtins__. CPython's exec() then auto-injected the full builtins module, leaving __import__, open, eval, exec and the whole import machinery reachable regardless of the allow-list — e.g. `__im…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-10561 has been found in langlow.
Attackers can target a specific entry point like PythonREPLComponent over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 10.0/10.
What to do: upgrade langlow to 1.10.1 or later.
If unsure, ask your IT team or search "langlow CVE-2026-10561" on the vendor's site.

CVE-2026-10561 (langlow) — CWE-94 / CVSS v3 10.0
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: PythonREPLComponent / PythonREPLToolComponent / is_superuser / langflow
Patched: 1.10.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Arbitrary code execution (CWE-94) exists in langlow. Attackers reach the vulnerable code path via PythonREPLComponent without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of langlow. Attack surface: PythonREPLComponent / PythonREPLToolComponent / is_superuser / langflow.

🔥 Severity

Severity: Critical (CVSS 10.0/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.10.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'langlow' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'langlow' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で langlow を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade langlow to 1.10.1

    ステージング環境で 1.10.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip langlow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.1"}]}]
pip langflow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.1"}]}]
PyPI langflow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.1"}]}]

References

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