# CVE-2026-7658: Langflow OSS is affected by arbitrary code execution in custom component validation and trusted code enforcement

> Attackers can exploit path traversal in username validation to delete directories, destroy cross-tenant data, and remove JWT signing keys in Langflow OSS.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Aug 2026
- **Updated:** 5 Aug 2026
- **Also known as:** GHSA-59wg-6v2q-cr6p

## What is CVE-2026-7658?

CVE-2026-7658 is a medium-severity path traversal vulnerability in Langflow Langflow, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate the username field, allowing attackers to inject path traversal sequences and bypass containment checks. This enables multiple severe impacts, including arbitrary directory deletion, cross-tenant data destruction, and JWT signing key deletion leading to session invalidation.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-7658?

It affects 1 product.


Products: Langflow Langflow.

## How do I fix CVE-2026-7658?

No fix has been published for CVE-2026-7658 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7658 being exploited?

There is no known exploitation of CVE-2026-7658 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-2026-7658 and fix it if it is affected.

What it is: CVE-2026-7658 is a medium-severity path traversal vulnerability in Langflow Langflow, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-7658 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-2026-7658/ (Markdown: https://insights.sbomify.com/CVE-2026-7658/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7658
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7658
- OSV: https://osv.dev/vulnerability/CVE-2026-7658

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7658/
Summaries are generated and may contain mistakes; the official description above is the record.