# CVE-2026-42345: Server-side request forgery in FastGPT

> Attackers can bypass SSRF protections in FastGPT to access cloud metadata endpoints via URL encoding tricks, potentially exposing sensitive credentials.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/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:** 8 May 2026
- **Updated:** 13 May 2026
- **Also known as:** GHSA-jhqw-944x-xh94

## What is CVE-2026-42345?

CVE-2026-42345 is a high-severity server-side request forgery vulnerability in labring FastGPT, published on 8 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

FastGPT is an AI Agent building platform. In versions 4.14.11 and prior, FastGPT's isInternalAddress() function in packages/service/common/system/utils.ts blocks cloud metadata endpoints using a fullUrl.startsWith() check against a hardcoded list. This check can be bypassed using at least 7 different URL encoding techniques, all of which resolve to the same cloud metadata service but do not match the blocklist patterns. Additionally, the broader private IP check (isInternalIPv4/isInternalIPv6) is disabled by default because CHECK_INTERNAL_IP defaults to false (not 'true'), so these bypasses reach the metadata endpoint without any further validation. At time of publication, there are no publicly available patches.

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

## Which versions are affected by CVE-2026-42345?


## How do I fix CVE-2026-42345?

No fix has been published for CVE-2026-42345 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-42345 being exploited?

There is no known exploitation of CVE-2026-42345 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42345 and fix it if it is affected.

What it is: CVE-2026-42345 is a high-severity server-side request forgery vulnerability in labring FastGPT, published on 8 May 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-2026-42345 in the wild and no public exploit code.

Affected product: labring FastGPT. 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-2026-42345/ (Markdown: https://insights.sbomify.com/CVE-2026-42345/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42345
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42345
- OSV: https://osv.dev/vulnerability/CVE-2026-42345

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42345/
Summaries are generated and may contain mistakes; the official description above is the record.