CVE-2025-3248
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedLangflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceLangflow versions before 1.3.0 contain a code injection vulnerability in the /api/v1/validate/code endpoint. An unauthenticated remote attacker can send specially crafted HTTP requests to this endpoint to execute arbitrary code on the target system, achieving full remote code execution without any authentication credentials.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 1.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Langflow is runningCheck for running Python processes or services named 'langflow' using commands like 'ps aux | grep -i langflow' or 'docker ps' if containerizedAffected if Langflow process or container is running and the version is below 1.3.0
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Determine installed Langflow versionRun 'pip show langflow' or check the package version in your dependency lock file (requirements.txt, pyproject.toml, poetry.lock)Affected if The displayed version is earlier than 1.3.0 (e.g., 1.2.x, 1.1.x, 1.0.x)
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Verify the vulnerable endpoint existsCheck if the Langflow API serves the /api/v1/validate/code path by reviewing reverse proxy configs, API route definitions in the codebase, or attempting a HEAD request to the endpointAffected if The endpoint is present and reachable without authentication
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Check network exposure of the APIReview firewall rules, reverse proxy configurations, or Kubernetes network policies to determine if the /api/v1/validate/code endpoint is exposed to untrusted networksAffected if The endpoint is accessible from the internet or untrusted internal networks without authentication barriers
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Look for signs of exploitationReview server access logs and application logs for POST requests to /api/v1/validate/code with unexpected payload patterns, and check for new or suspicious shell processes spawned by the langflow service userAffected if Log entries show requests to the vulnerable endpoint from untrusted sources or unexpected code execution patterns
You are affected if Langflow is running any version earlier than 1.3.0 and the /api/v1/validate/code endpoint is accessible without authentication.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped1.3.0
Upgrade Langflow to version 1.3.0 or later to remediate this vulnerability. If immediate patching is not possible, consider restricting network access to the /api/v1/validate/code endpoint via firewall rules or API gateway controls.
Langflow 1.3.0
- Identify the current Langflow version running in your environment
- Back up your Langflow data, configurations, and any custom flows before upgrading
- Upgrade Langflow to version 1.3.0 or later using your package manager (e.g., pip install langflow==1.3.0 or higher)
- Restart the Langflow service to apply the update
- Verify the upgrade was successful by checking the installed version
- Test that the /api/v1/validate/code endpoint now requires authentication before allowing code execution
- Consult the Langflow 1.3.0 release notes for any configuration or behavior changes that may affect your deployment
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-3248 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-3248 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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