CVE-2026-86539

HIGHPre-NVD 7.27.2—
EchelonGraph scoreHIGH confidence

Score 7.2 from GitHub Security Advisory published 2026-09-08. the CNA's CVSS baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.2
EG Score
7.2(high)
EG Risk
47(Track)
EG Risk 47/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity72% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 11, 2026

Advisory Details (4)

Auto-updated Sep 7, 2026
Patch available. Sources: github.
generic

knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/knowns-through-0.33.0-server-side-request-forgery-via-embedding-models-endpoint
generic

knowns/internal/server/routes/imports.go at v0.33.0 · knowns-dev/knowns · GitHub

https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/imports.go#L317-L330
generic

knowns/internal/server/routes/embedding_models.go at v0.33.0 · knowns-dev/knowns · GitHub

https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/embedding_models.go#L64-L110
github Patch Available

Multiple Server-Side Request Forgery (SSRF) Vectors allowing Internal Reachability Oracle and Arbitrary Proxying · Advisory · knowns-dev/knowns · GitHub

https://github.com/knowns-dev/knowns/security/advisories/GHSA-qx9v-m9gg-p5jg

Vendor Advisories for CVE-2026-86539(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 28× in last 7d / 58× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-21 08:49 UTCGHSA enrichment
  2. 2026-09-20 21:32 UTCEG score recompute
  3. 2026-09-20 21:32 UTCGHSA enrichment
  4. 2026-09-20 20:16 UTCEPSS rescore
  5. 2026-09-20 10:15 UTCGHSA enrichment
  6. 2026-09-19 22:58 UTCEG score recompute
  7. 2026-09-19 22:58 UTCGHSA enrichment
  8. 2026-09-19 11:41 UTCGHSA enrichment
  9. 2026-09-19 00:24 UTCEG score recompute
  10. 2026-09-19 00:24 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 13:08 UTCGHSA enrichment
  13. 2026-09-18 01:51 UTCEG score recompute
  14. 2026-09-18 01:51 UTCGHSA enrichment
  15. 2026-09-17 19:32 UTCEPSS rescore
  16. 2026-09-17 14:35 UTCGHSA enrichment
  17. 2026-09-17 03:17 UTCGHSA enrichment
  18. 2026-09-16 16:00 UTCEG score recompute
  19. 2026-09-16 16:00 UTCGHSA enrichment
  20. 2026-09-16 14:09 UTCEPSS rescore
  21. 2026-09-16 05:15 UTCEPSS rescore
  22. 2026-09-16 04:44 UTCGHSA enrichment
  23. 2026-09-15 17:27 UTCGHSA enrichment
  24. 2026-09-15 06:11 UTCEG score recompute
  25. 2026-09-15 06:10 UTCGHSA enrichment
Show 33 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-15 03:12 UTCEPSS rescore
  3. 2026-09-14 18:54 UTCGHSA enrichment
  4. 2026-09-14 07:36 UTCGHSA enrichment
  5. 2026-09-13 20:20 UTCEG score recompute
  6. 2026-09-13 20:20 UTCGHSA enrichment
  7. 2026-09-13 09:03 UTCGHSA enrichment
  8. 2026-09-12 21:47 UTCEG score recompute
  9. 2026-09-12 21:47 UTCGHSA enrichment
  10. 2026-09-12 10:30 UTCGHSA enrichment
  11. 2026-09-11 23:13 UTCEG score recompute
  12. 2026-09-11 23:13 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 11:18 UTCEG score recompute
  16. 2026-09-11 11:18 UTCGHSA enrichment
  17. 2026-09-11 01:23 UTCGHSA enrichment
  18. 2026-09-10 14:07 UTCEG score recompute
  19. 2026-09-10 14:07 UTCGHSA enrichment
  20. 2026-09-10 02:48 UTCGHSA enrichment
  21. 2026-09-09 15:31 UTCEG score recompute
  22. 2026-09-09 15:31 UTCGHSA enrichment
  23. 2026-09-09 14:55 UTCEG score recompute
  24. 2026-09-09 14:55 UTCGHSA enrichment
  25. 2026-09-09 07:29 UTCEG score recompute
  26. 2026-09-09 07:29 UTCGHSA enrichment
  27. 2026-09-08 22:01 UTCEPSS rescore
  28. 2026-09-08 20:12 UTCGHSA enrichment
  29. 2026-09-08 10:59 UTCEG score recompute
  30. 2026-09-08 10:59 UTCGHSA enrichment
  31. 2026-09-07 23:35 UTCEG score recompute
  32. 2026-09-07 23:07 UTCEG score recompute
  33. 2026-09-07 23:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86539?
CVE-2026-86539 is a high vulnerability published on September 7, 2026. 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…
When was CVE-2026-86539 disclosed?
CVE-2026-86539 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86539 actively exploited?
CVE-2026-86539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.0% of all scored CVEs.
What is the CVSS score of CVE-2026-86539?
CVE-2026-86539 has a CVSS v4.0 base score of 7.2 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-86539?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86539, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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