[ CVE-2026-51886 · Published 1 Oct 2026 ]
Langflow: Title Authenticated Remote Code Execution in validate_code via Malicious Decorators Description
[ Why it matters ]Priority signals
- Public proof-of-concept exploit exists (CISA SSVC)
- Critical severity: CVSS 9.8
[ Description ]Official description
langflow-ai langflow v1.9.3 is affected by: Code Injection. The impact is: execute arbitrary code (remote). The component is: src/backend/base/langflow/api/v1/validate.py:validate-post_validate_code-a-real-authenticated-http-post-to-api-v1. The attack vector is: Attack surface: HTTP or browser-backed service path. A public-facing route accepts raw Python source and forwards it into a server-side compile/exec validation path without any visible entitlement guard. ¶¶ A weakness has been identified in langflow-ai langflow up to 1.9.3. langflow contains a code injection vulnerability in validate-post_validate_code-a-real-authenticated-http-post-to-api-v1 (src/backend/base/langflow/api/v1/validate.py:13). An authenticated attacker can execute arbitrary Python code on the server by submitting malicious code to the /api/v1/validate/code endpoint, which directly executes user-supplied code without sandboxing or security controls.
[ Fixes ]Fixes and patches
- langflow 1.10.1Fixed version · GitHub Advisories · pip package langflow: upgrade to 1.10.1 or later (affected >= 1.7.2, < 1.10.1)
[ Packages ]Affected open-source packages
- langflow pipAffected >= 1.7.2, < 1.10.1 · fixed in 1.10.1 · GHSA-w584-2h2r-2hvf