CVE-2026-51994

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.1Exploit: None knownExposed services: Not assessed

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

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery (SSRF) via the resource_metadata URL extracted from a remote MCP server's WWW-Authenticate header

CVSS v3
9.1
EG Score
9.1CRITICALhigh confidence
EG Risk
56
EG Risk 56/100CISA SSVC

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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

September 25, 2026

Advisory Details (4)

Auto-updated Sep 25, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet. Sources: github.
generic

mcp-remote-oauth-security/advisories/F-01-resource-metadata-ssrf.md at v1.0.1 · playb0t/mcp-remote-oauth-security · GitHub

https://github.com/playb0t/mcp-remote-oauth-security/blob/v1.0.1/advisories/F-01-resource-metadata-ssrf.md
generic🔴 Active Exploitation

GitHub - playb0t/mcp-remote-oauth-security: Seven evidence-bounded OAuth trust-boundary security advisories for geelen/mcp-remote, reviewed through 0.1.38. · GitHub

https://github.com/playb0t/mcp-remote-oauth-security#readme
github

Security Advisories · punkpeye/mcp-remote · GitHub

https://github.com/geelen/mcp-remote/security/advisories
generic🔴 Active Exploitation

GitHub - punkpeye/mcp-remote: Connect an MCP Client that only supports local (stdio) servers to a Remote MCP Server. · GitHub

https://github.com/geelen/mcp-remote

Vendor Advisories for CVE-2026-51994(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 53× in last 7d / 75× 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. 2026-10-04 09:47 UTCGHSA enrichment
  2. 2026-10-04 05:33 UTCGHSA enrichment
  3. 2026-10-04 01:21 UTCGHSA enrichment
  4. 2026-10-03 21:10 UTCGHSA enrichment
  5. 2026-10-03 16:57 UTCEG score recompute
  6. 2026-10-03 16:57 UTCGHSA enrichment
  7. 2026-10-03 14:26 UTCEPSS rescore
  8. 2026-10-03 12:46 UTCGHSA enrichment
  9. 2026-10-03 08:33 UTCGHSA enrichment
  10. 2026-10-03 04:10 UTCGHSA enrichment
  11. 2026-10-02 23:58 UTCGHSA enrichment
  12. 2026-10-02 19:45 UTCEG score recompute
  13. 2026-10-02 19:45 UTCGHSA enrichment
  14. 2026-10-02 17:56 UTCEPSS rescore
  15. 2026-10-02 15:33 UTCGHSA enrichment
  16. 2026-10-02 11:21 UTCGHSA enrichment
  17. 2026-10-02 07:05 UTCGHSA enrichment
  18. 2026-10-02 02:54 UTCGHSA enrichment
  19. 2026-10-01 22:37 UTCEG score recompute
  20. 2026-10-01 22:37 UTCGHSA enrichment
  21. 2026-10-01 19:50 UTCEPSS rescore
  22. 2026-10-01 18:23 UTCGHSA enrichment
  23. 2026-10-01 13:53 UTCGHSA enrichment
  24. 2026-10-01 09:42 UTCGHSA enrichment
  25. 2026-10-01 05:30 UTCGHSA enrichment
Show 50 more
  1. 2026-10-01 01:18 UTCGHSA enrichment
  2. 2026-09-30 21:06 UTCGHSA enrichment
  3. 2026-09-30 16:54 UTCEG score recompute
  4. 2026-09-30 16:54 UTCGHSA enrichment
  5. 2026-09-30 15:03 UTCEPSS rescore
  6. 2026-09-30 12:42 UTCGHSA enrichment
  7. 2026-09-30 08:28 UTCGHSA enrichment
  8. 2026-09-30 04:16 UTCGHSA enrichment
  9. 2026-09-30 00:04 UTCGHSA enrichment
  10. 2026-09-29 16:17 UTCEG score recompute
  11. 2026-09-29 16:17 UTCGHSA enrichment
  12. 2026-09-29 12:04 UTCGHSA enrichment
  13. 2026-09-29 07:53 UTCGHSA enrichment
  14. 2026-09-29 03:42 UTCGHSA enrichment
  15. 2026-09-28 23:29 UTCEG score recompute
  16. 2026-09-28 23:29 UTCGHSA enrichment
  17. 2026-09-28 19:17 UTCGHSA enrichment
  18. 2026-09-28 15:03 UTCEG score recompute
  19. 2026-09-28 15:03 UTCGHSA enrichment
  20. 2026-09-28 13:51 UTCEPSS rescore
  21. 2026-09-28 10:48 UTCGHSA enrichment
  22. 2026-09-28 06:37 UTCGHSA enrichment
  23. 2026-09-28 02:25 UTCGHSA enrichment
  24. 2026-09-27 22:13 UTCGHSA enrichment
  25. 2026-09-27 18:01 UTCGHSA enrichment
  26. 2026-09-27 13:49 UTCEG score recompute
  27. 2026-09-27 13:49 UTCGHSA enrichment
  28. 2026-09-27 13:48 UTCEPSS rescore
  29. 2026-09-27 09:35 UTCGHSA enrichment
  30. 2026-09-27 05:23 UTCGHSA enrichment
  31. 2026-09-27 01:10 UTCGHSA enrichment
  32. 2026-09-26 20:55 UTCGHSA enrichment
  33. 2026-09-26 16:44 UTCEG score recompute
  34. 2026-09-26 16:43 UTCGHSA enrichment
  35. 2026-09-26 15:59 UTCEPSS rescore
  36. 2026-09-26 12:29 UTCGHSA enrichment
  37. 2026-09-26 08:17 UTCGHSA enrichment
  38. 2026-09-26 04:03 UTCEG score recompute
  39. 2026-09-26 04:02 UTCGHSA enrichment
  40. 2026-09-26 00:27 UTCEPSS rescore
  41. 2026-09-25 23:49 UTCEG score recompute
  42. 2026-09-25 23:49 UTCGHSA enrichment
  43. 2026-09-25 19:34 UTCGHSA enrichment
  44. 2026-09-25 18:33 UTCEG score recompute▲ 9.10
  45. 2026-09-25 18:33 UTCGHSA enrichment
  46. 2026-09-25 18:31 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  47. 2026-09-24 21:16 UTCGHSA enrichment
  48. 2026-09-24 15:28 UTCNVD update
  49. 2026-09-24 14:48 UTCEG score recompute
  50. 2026-09-24 14:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51994?
CVE-2026-51994 is a critical vulnerability published on September 24, 2026. mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery (SSRF) via the resource_metadata URL extracted from a remote MCP server's WWW-Authenticate header
When was CVE-2026-51994 disclosed?
CVE-2026-51994 was first published on September 24, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51994 actively exploited?
CVE-2026-51994 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-51994?
CVE-2026-51994 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51994?
No fix for CVE-2026-51994 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-51994 are linked in the Vendor Advisories panel on this page.

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