A security vulnerability has been detected in modelcontextprotocol mcp-server-fetch and mcp-server-everything up to 2026.6.4. Affected is the function fetch_url of the file mcp_server_fetch/server.py of the component Fetch Tool. The manipulation of the argument url/path leads to server-side request forgery. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.
CVE-2026-104120
HIGHPre-NVD 7.37.3—Trending — 5 sources updated this week
EchelonGraph scoreHIGH confidence
Score 7.3 from GitHub Security Advisory published 2026-10-02. A secondary CVSS source baseline 7.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.3Exploit: None knownExposed services: Not assessed
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
- CVSS v3
- 7.3
- EG Score
- 7.3HIGHhigh confidence
- EG Risk
- 37EG Risk 37/100CISA 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 computedSeverity73% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or 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
- 0.3%
- EPSS %ILE
- 19th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or 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 (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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
October 2, 2026
Last Modified
October 2, 2026
Advisory Details (2)
Auto-updated Oct 2, 2026No patch confirmed yet. Sources: github_pr.
github_pr
fix(fetch): guard against private-IP and cloud metadata SSRF (#4838)
Upstream fix in progress (PR #4890 · modelcontextprotocol/servers, state=open)
https://github.com/modelcontextprotocol/servers/pull/4890generic
GHSAs · Issue #4492 · modelcontextprotocol/servers · GitHub
https://github.com/modelcontextprotocol/servers/issues/4492Vendor Advisories for CVE-2026-104120(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 12× in last 7d / 12× 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.
- 2026-10-04 04:15 UTCGHSA enrichment
- 2026-10-03 15:20 UTCEG score recompute
- 2026-10-03 15:19 UTCGHSA enrichment
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-03 02:22 UTCEG score recompute
- 2026-10-03 02:21 UTCGHSA enrichment
- 2026-10-02 13:23 UTCEG score recompute
- 2026-10-02 13:23 UTCGHSA enrichment
- 2026-10-02 03:29 UTCEG score recompute
- 2026-10-02 03:29 UTCNVD updateCVSS v4 → 5.5
- 2026-10-02 02:38 UTCEG score recompute
- 2026-10-02 02:35 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-104120?
CVE-2026-104120 is a high vulnerability published on October 2, 2026. A security vulnerability has been detected in modelcontextprotocol mcp-server-fetch and mcp-server-everything up to 2026.6.4. Affected is the function fetchurl of the file mcpserver_fetch/server.py of the component Fetch Tool. The manipulation of the argument url/path leads to server-side request…
When was CVE-2026-104120 disclosed?
CVE-2026-104120 was first published on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-104120 actively exploited?
CVE-2026-104120 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-104120?
CVE-2026-104120 has a CVSS base score of 7.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-104120?
No fix for CVE-2026-104120 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-2026-104120 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-104120
Is Your Infrastructure Affected by CVE-2026-104120?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.