Next.js is a React framework for building full-stack web applications. From 16.0.0 until 16.3.8, the next dev development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website visited by a developer can reach the endpoint and read the project's disk location, source code snippets from error reports, route inventory, and development logs. Production deployments do not serve this endpoint. This issue is fixed in version 16.3.8.
CVE-2026-94486
LOWPre-NVD 2.32.3Trending — 3 sources updated this week
EchelonGraph scoreLOW confidence
This low-severity CVE scores 2.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
2.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 2.3Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 2.3
- EG Score
- 2.3LOWlow confidence
- EG Risk
- 10EG Risk 10/100CISA 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 computedSeverity23% × 45%Exploitation0% × 40%Automatability0% × 15%CISA SSVC: Track at every mission impact level.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.2%
- EPSS %ILE
- 6th
- KEV
- Not listed
CISA SSVCTrack at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
October 2, 2026
Last Modified
October 2, 2026
References (3)
- security-advisories@githubhttps://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476
- security-advisories@githubhttps://github.com/vercel/next.js/releases/tag/v16.3.8
- security-advisories@githubhttps://github.com/vercel/next.js/security/advisories/GHSA-39w2-rjm5-chcv
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× 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 23:23 UTCEPSS rescore
- 2026-10-03 14:26 UTCEPSS rescore
- 2026-10-02 17:29 UTCEG score recompute
- 2026-10-02 16:28 UTCEG score recompute
- 2026-10-02 15:31 UTCEG score recompute
- 2026-10-02 15:30 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-94486?
CVE-2026-94486 is a low vulnerability published on October 2, 2026. Next.js is a React framework for building full-stack web applications. From 16.0.0 until 16.3.8, the next dev development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website visited by a developer can reach the endpoint and read the…
When was CVE-2026-94486 disclosed?
CVE-2026-94486 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-2026-94486 actively exploited?
CVE-2026-94486 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-94486?
CVE-2026-94486 has a CVSS base score of 2.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-94486?
A fix for CVE-2026-94486 is available — its CVE record says: "This issue is fixed in version 16.3.8."
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-94486
Is Your Infrastructure Affected by CVE-2026-94486?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.