CVE-2026-51996

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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

An issue in geelen mcp-remote 0.1.16 through 0.1.38 allows a remote attacker to execute arbitrary code via the src/lib/utils.ts and the getServerUrlHash function

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
59
EG Risk 59/100CISA 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
Severity98% × 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
0.5%
EPSS %ILE
38th
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 29, 2026

Advisory Details (3)

Auto-updated Sep 29, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet. Sources: github.
generic

mcp-remote-oauth-security/advisories/F-04-md5-token-isolation.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-04-md5-token-isolation.md
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-2026-51996(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 57× 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 10:40 UTCGHSA enrichment
  2. 2026-10-04 06:45 UTCGHSA enrichment
  3. 2026-10-04 02:52 UTCGHSA enrichment
  4. 2026-10-03 23:00 UTCGHSA enrichment
  5. 2026-10-03 19:06 UTCGHSA enrichment
  6. 2026-10-03 15:08 UTCEG score recompute
  7. 2026-10-03 15:08 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 11:09 UTCGHSA enrichment
  10. 2026-10-03 07:15 UTCGHSA enrichment
  11. 2026-10-03 03:22 UTCGHSA enrichment
  12. 2026-10-02 23:29 UTCGHSA enrichment
  13. 2026-10-02 19:32 UTCEG score recompute
  14. 2026-10-02 19:32 UTCGHSA enrichment
  15. 2026-10-02 17:56 UTCEPSS rescore
  16. 2026-10-02 15:39 UTCGHSA enrichment
  17. 2026-10-02 11:47 UTCGHSA enrichment
  18. 2026-10-02 07:50 UTCGHSA enrichment
  19. 2026-10-02 03:58 UTCGHSA enrichment
  20. 2026-10-02 00:03 UTCEG score recompute
  21. 2026-10-02 00:03 UTCGHSA enrichment
  22. 2026-10-01 19:50 UTCEPSS rescore
  23. 2026-10-01 19:48 UTCGHSA enrichment
  24. 2026-10-01 15:56 UTCGHSA enrichment
  25. 2026-10-01 12:03 UTCGHSA enrichment
Show 32 more
  1. 2026-10-01 08:11 UTCGHSA enrichment
  2. 2026-10-01 04:18 UTCGHSA enrichment
  3. 2026-10-01 00:25 UTCGHSA enrichment
  4. 2026-09-30 20:29 UTCGHSA enrichment
  5. 2026-09-30 16:37 UTCEG score recompute
  6. 2026-09-30 16:37 UTCGHSA enrichment
  7. 2026-09-30 15:03 UTCEPSS rescore
  8. 2026-09-30 11:43 UTCGHSA enrichment
  9. 2026-09-30 07:50 UTCGHSA enrichment
  10. 2026-09-30 03:57 UTCGHSA enrichment
  11. 2026-09-30 00:04 UTCGHSA enrichment
  12. 2026-09-29 16:45 UTCGHSA enrichment
  13. 2026-09-29 16:03 UTCEG score recompute
  14. 2026-09-29 16:03 UTCGHSA enrichment
  15. 2026-09-29 15:13 UTCGHSA enrichment
  16. 2026-09-29 11:20 UTCGHSA enrichment
  17. 2026-09-29 07:24 UTCGHSA enrichment
  18. 2026-09-29 03:32 UTCEG score recompute
  19. 2026-09-29 03:31 UTCGHSA enrichment
  20. 2026-09-29 02:36 UTCEG score recompute▲ 9.80
  21. 2026-09-29 02:36 UTCGHSA enrichment
  22. 2026-09-29 02:35 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  23. 2026-09-28 13:51 UTCEPSS rescore
  24. 2026-09-27 21:29 UTCEG score recompute
  25. 2026-09-27 21:29 UTCGHSA enrichment
  26. 2026-09-27 13:48 UTCEPSS rescore
  27. 2026-09-26 15:59 UTCEPSS rescore
  28. 2026-09-26 00:27 UTCEPSS rescore
  29. 2026-09-24 21:16 UTCGHSA enrichment
  30. 2026-09-24 15:28 UTCNVD update
  31. 2026-09-24 14:48 UTCEG score recompute
  32. 2026-09-24 14:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51996?
CVE-2026-51996 is a critical vulnerability published on September 24, 2026. An issue in geelen mcp-remote 0.1.16 through 0.1.38 allows a remote attacker to execute arbitrary code via the src/lib/utils.ts and the getServerUrlHash function
When was CVE-2026-51996 disclosed?
CVE-2026-51996 was first published on September 24, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51996 actively exploited?
CVE-2026-51996 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-51996?
CVE-2026-51996 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51996?
No fix for CVE-2026-51996 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-2026-51996 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-51996

Explore →

Is Your Infrastructure Affected by CVE-2026-51996?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs