CVE-2026-40516 HIGH

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

Vendor Hkuds
Product OpenHarness
Weakness CWE-918 · SSRF
Published April 17, 2026
Last update April 17, 2026

CVSS base score

7.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 17, 2026 CVE published
April 17, 2026 Record updated