CVE-2026-86539 json
knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint
published 2mo ago modified last mo. also EUVD-2026-72557 , GHSA-qx9v-m9gg-p5jg
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository knowns-dev/knowns. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm knowns 0.30.0
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- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | knowns | <=0.29.1 |
0.30.0 |
Affected products
- knowns-dev knowns
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/knowns-dev/knowns/security/advisories/GHSA-qx9v-m9gg-p5jg
vendor-advisory, advisory
-
github.com
/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/embedding_models.go#L64-L110
technical-description
-
github.com
/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/imports.go#L317-L330
technical-description
-
vulncheck.com
/advisories/knowns-through-0.33.0-server-side-request-forgery-via-embedding-models-endpoint
third-party-advisory
Sources
- CVE List CVE-2026-86539
- NVD CVE-2026-86539
- Maintainer advisory GHSA-qx9v-m9gg-p5jg
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of knowns-dev/knowns published their own advisory on GitHub. Reviewed sources take precedence over it.