CVE-2026-86539 Details
Description
knowns through 0.33.0 contains a server-side request forgery vulnerability in the POST /api/embedding-models/test endpoint that issues outbound requests to caller-supplied destinations without validation. Attackers can enumerate internal hosts and cloud metadata endpoints by observing transport error messages that reveal network reachability information.
A server-side request forgery (SSRF) vulnerability has been identified in Known's embedding model test endpoint, available through version 0.33.0. This vulnerability allows attackers to send outbound requests to destinations of their choice, without any validation. By exploiting this flaw, attackers can enumerate internal hosts and access cloud metadata endpoints, such as those on AWS, GCP, or Azure. The vulnerability arises from the endpoint's failure to validate user-supplied data, combined with the exposure of detailed error messages that reveal network reachability information.
Users are advised to update to version 0.30.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 7, 2026CISA-ADP
Assessed Sep 9, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| knowns | <= 0.33.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | CISA-ADP |
| Sep 7, 2026 | New CVE Received | [email protected] |