# CVE-2026-51888: Path traversal in n/a

> Attackers can write or overwrite arbitrary files outside the intended directory via absolute paths in the knowledge base creation endpoint.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:** 1 Oct 2026
- **Updated:** 6 Oct 2026
- **Also known as:** GHSA-5rwq-2vwh-7g73

## What is CVE-2026-51888?

CVE-2026-51888 is a high-severity path traversal vulnerability in n/a, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

langflow-ai langflow v1.8.4 is affected by: Directory Traversal. The impact is: Arbitrary file write outside the intended workspace or storage boundary.. The component is: src/backend/base/langflow/api/v1/knowledge_bases.py:knowledge_bases-create_knowledge_base-a-live-http-post-to-create-knowledge-base. The attack vector is: Attack surface: HTTP or browser-backed service path. A public-facing upload or HTTP route handler forwards an attacker-controlled path or filename into host file creation without any visible boundary enforcement. ¶¶ A weakness has been identified in langflow-ai langflow up to 1.8.4. langflow contains an absolute path traversal vulnerability in knowledge_bases-create_knowledge_base-a-live-http-post-to-create-knowledge-base (src/backend/base/langflow/api/v1/knowledge_bases.py:51). An attacker can write or overwrite files outside the intended working directory by providing absolute paths in the knowledge base creation endpoint.

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

## Which versions are affected by CVE-2026-51888?


## How do I fix CVE-2026-51888?

No fix has been published for CVE-2026-51888 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-51888 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51888 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-51888 and fix it if it is affected.

What it is: CVE-2026-51888 is a high-severity path traversal vulnerability in n/a, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51888 exists.

Affected product: n/a. 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-2026-51888/ (Markdown: https://insights.sbomify.com/CVE-2026-51888/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-51888
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-51888
- OSV: https://osv.dev/vulnerability/CVE-2026-51888

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-51888/
Summaries are generated and may contain mistakes; the official description above is the record.