CVE-2026-86539 knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint
Attackers can exploit an SSRF vulnerability in the embedding-models endpoint to enumerate internal hosts and access cloud metadata via unvalidated outbound requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86539?
CVE-2026-86539 is a medium-severity server-side request forgery vulnerability in knowns-dev knowns, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-86539?
How do I fix CVE-2026-86539?
No fix has been published for CVE-2026-86539 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-86539 being exploited?
There is no known exploitation of CVE-2026-86539 in the wild and no public exploit code.
Sources
Also known as GHSA-fc26-7cjr-27x6, GHSA-qx9v-m9gg-p5jg.