# CVE-2026-40516: OpenHarness SSRF via web_fetch and web_search

> Attackers can exploit OpenHarness to access private network services and cloud metadata via SSRF in web tools, risking sensitive data exposure.

- **Severity:** High 7.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:L/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Apr 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-785m-9q28-jp3m

## What is CVE-2026-40516?

CVE-2026-40516 is a high-severity server-side request forgery vulnerability in HKUDS OpenHarness, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and web_search tools that allows attackers to access private and localhost HTTP services by manipulating tool parameters without proper validation of target addresses. Attackers can influence an agent session to invoke these tools against loopback, RFC1918, link-local, or other non-public addresses to read response bodies from local development services, cloud metadata endpoints, admin panels, or other private HTTP services reachable from the victim host.

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

## Which versions are affected by CVE-2026-40516?

It affects 1 product.


Products: Hkuds Openharness.

## How do I fix CVE-2026-40516?

No fix has been published for CVE-2026-40516 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40516 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40516 exists.

## Other vulnerabilities in HKUDS OpenHarness

- [CVE-2026-7551](https://insights.sbomify.com/CVE-2026-7551/): HKUDS OpenHarness Remote Command Execution via /bridge Slash Command (high 8.7)
- [CVE-2026-6819](https://insights.sbomify.com/CVE-2026-6819/): HKUDS OpenHarness Plugin Management Command Exposure (high 8.7)
- [CVE-2026-40515](https://insights.sbomify.com/CVE-2026-40515/): OpenHarness Permission Bypass via grep and glob root argument (high 8.7)
- [CVE-2026-40502](https://insights.sbomify.com/CVE-2026-40502/): OpenHarness Remote Administrative Command Injection via Gateway Handler (high 8.7)
- [CVE-2026-6823](https://insights.sbomify.com/CVE-2026-6823/): HKUDS OpenHarness Insecure Default Remote Channel Allowlist (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40516 and fix it if it is affected.

What it is: CVE-2026-40516 is a high-severity server-side request forgery vulnerability in HKUDS OpenHarness, published on 17 Apr 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-2026-40516 exists.

Affected product: HKUDS OpenHarness. 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-2026-40516/ (Markdown: https://insights.sbomify.com/CVE-2026-40516/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40516
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40516
- OSV: https://osv.dev/vulnerability/CVE-2026-40516

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-40516/
Summaries are generated and may contain mistakes; the official description above is the record.