High severity8.3NVD Advisory· Published Apr 17, 2026· Updated Apr 24, 2026
CVE-2026-40516
CVE-2026-40516
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.
Affected products
1Patches
1bd4df81f634fhttps://github.com/HKUDS/OpenHarnessvia nvd-ref
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
3- github.com/HKUDS/OpenHarness/commit/bd4df81f634f8c7cddcc3fdf7f561a13dcbf03aenvdPatch
- github.com/HKUDS/OpenHarness/pull/92nvdExploitIssue Tracking
- www.vulncheck.com/advisories/openharness-ssrf-via-web-fetch-and-web-searchnvdThird Party Advisory
News mentions
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