High severity · published Sep 7, 2026
CVE-2026-86539
knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint
7.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KN
knowns · knowns-dev
through 0.33.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86539
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86539
github.com
https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/embedding_models.go#L64-L110
github.com
https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/imports.go#L317-L330
github.com
https://github.com/knowns-dev/knowns/security/advisories/GHSA-qx9v-m9gg-p5jg
www.vulncheck.com
https://www.vulncheck.com/advisories/knowns-through-0.33.0-server-side-request-forgery-via-embedding-models-endpoint
More from knowns
9.8
CVE-2026-88899
knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header
9.8
CVE-2026-86543
knowns before 0.30.0 Unauthenticated Management API Exposure
9.1
CVE-2026-86542
knowns before 0.30.0 Path Traversal via Import Name
8.8
CVE-2026-88937
knowns through 0.33.0 Path Traversal via Template Engine
8.8
CVE-2026-86439
knowns before 0.30.0 Path Traversal via MCP doc and memory tools