# CVE-2026-81213: Langflow is vulnerable to server-side request forgery due to missing egress validation on server-side URL fetches

> Remote attackers can access internal network resources via improper URL validation in Langflow OSS, requiring a patch.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Sep 2026
- **Updated:** 11 Sep 2026
- **Also known as:** GHSA-hq58-536x-mhhx

## What is CVE-2026-81213?

CVE-2026-81213 is a high-severity server-side request forgery vulnerability in Langflow Langflow, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote attacker to obtain sensitive information from internal network resources due to improper validation of user-supplied URLs.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-81213?

It affects 1 product.


Products: Langflow Langflow.

## How do I fix CVE-2026-81213?

No fix has been published for CVE-2026-81213 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-81213 being exploited?

There is no known exploitation of CVE-2026-81213 in the wild and no public exploit code.

## Other vulnerabilities in Langflow Langflow

- [CVE-2026-9198](https://insights.sbomify.com/CVE-2026-9198/): IBM Langflow Code Injection (critical 9.8, exploited in the wild)
- [CVE-2026-0770](https://insights.sbomify.com/CVE-2026-0770/): Langflow Inclusion of Functionality from Untrusted Control Sphere (critical 9.8, exploited in the wild)
- [CVE-2025-3248](https://insights.sbomify.com/CVE-2025-3248/): Langflow Missing Authentication (critical 9.8, exploited in the wild)
- [CVE-2025-34291](https://insights.sbomify.com/CVE-2025-34291/): Langflow Origin Validation Error (critical 9.4, exploited in the wild)
- [CVE-2026-33017](https://insights.sbomify.com/CVE-2026-33017/): Langflow Code Injection (critical 9.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81213 and fix it if it is affected.

What it is: CVE-2026-81213 is a high-severity server-side request forgery vulnerability in Langflow Langflow, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-81213 in the wild and no public exploit code.

Affected product: Langflow Langflow. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-81213/ (Markdown: https://insights.sbomify.com/CVE-2026-81213/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81213
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81213
- OSV: https://osv.dev/vulnerability/CVE-2026-81213

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81213/
Summaries are generated and may contain mistakes; the official description above is the record.