CVE-2026-40516 OpenHarness SSRF via web_fetch and web_search

High 7.8 Published 17 Apr 2026 Updated 14 Jul 2026

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

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

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

Which versions are affected by CVE-2026-40516?

It affects 1 product.

Products include 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.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-40516 being exploited?

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

Sources

Also known as GHSA-785m-9q28-jp3m.