CVE-2026-86539: knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-07 · updated 2026-09-09
Weakness: CWE-918

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.

Affected products

knowns-dev knowns: through 0.33.0

References

https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/embedding_models.go#L64-L110
https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/imports.go#L317-L330
https://github.com/knowns-dev/knowns/security/advisories/GHSA-qx9v-m9gg-p5jg
https://www.vulncheck.com/advisories/knowns-through-0.33.0-server-side-request-forgery-via-embedding-models-endpoint

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