CVE-2026-86539Network attack vector

Internal host enumeration via unvalidated embedding requests

Published Sep 7, 2026 · Updated Sep 9, 2026

SSRF in the embedding-model test endpoint in Knowns 0 through 0.33.0 allows remote attackers to enumerate internal hosts and metadata services. The test handler appends /embeddings to a caller-supplied apiBase, sends an outbound POST without destination validation, and returns raw transport errors as a reachability oracle. Unauthenticated reachability requires a server started without a password; the disclosed effect is network reachability disclosure rather than response-body access.

CVSS severity6.9
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in the embedding-model test endpoint in Knowns 0 through 0.33.0 allows remote attackers to enumerate internal hosts and metadata services. The test handler appends /embeddings to a caller-supplied apiBase, sends an outbound POST without destination validation, and returns raw transport errors as a reachability oracle. Unauthenticated reachability requires a server started without a password; the disclosed effect is network reachability disclosure rather than response-body access.

The record

CVE
CVE-2026-86539
Published
Sep 7, 2026
Updated
Sep 9, 2026
Vendor
Knowns
Product
Knowns
Classifications
CWE-918, T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.33.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Knowns · Knownsversion=0 <=0.33.0

Published CVSS scores

7.2VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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