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CVE-2026-94486

LOW 2.3

Published 2026-10-02 · Last modified 2026-10-02

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.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.1%chance of exploitation in 30 days · 1st percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

2.3CVSS 4.0 · LOW

  • ConfidentialityLow
  • IntegrityLow
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: Succeeds with passive user activity
  • ✓Complexity: No special conditions — reliably repeatable
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Vercel

Products Next.Js

Weakness (CWE)

  • CWE-346: : Origin Validation Error

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • next npm

    pkg:npm/next

    SEMVER range
    • Introduced version (included): 16.0.0
    • Fixed boundary (excluded): 16.3.8
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-39w2-rjm5-chcv/GHSA-39w2-rjm5-chcv.json"
  }
}
    GitHub Advisory Database · GHSA-39w2-rjm5-chcv · Updated 2026-10-07T20:45:05.342044468Z

Vendor product assessments

  • firefox as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox.src as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • thunderbird as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • thunderbird.src as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox.src as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox.src as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • thunderbird as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • thunderbird.src as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox-x11 as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox-x11

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • firefox.src as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • thunderbird as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • thunderbird.src as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/thunderbird?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • rhelai3/bootc-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-cuda-rhel9@sha256:b45f3bc25a7d3c9f3bfdc1de3be6db59f6c3109f62326d74fae14e832a797981?repository_url=registry.redhat.io/rhelai3/bootc-cuda-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • rhelai3/bootc-gaudi-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-gaudi-rhel9@sha256:e1057b59ca1be9501332abf97230855e85c7df858356be0da9dce230ea7e98e1?repository_url=registry.redhat.io/rhelai3/bootc-gaudi-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • rhelai3/bootc-rocm-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-rocm-rhel9@sha256:38ce057f97034bbb8eaea574d41cc7eebaeaa9265a4cdd966476dd3fac129c3c?repository_url=registry.redhat.io/rhelai3/bootc-rocm-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • rhelai3/disk-image-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known affected

    Vendor assessment for this product only.

    pkg:oci/disk-image-cuda-rhel9@sha256:5489bd1cdbb7f1a5ce80e9ad688b66c6bb8688b2b202a2a86b5c2205cdd6e126?repository_url=registry.redhat.io/rhelai3/disk-image-cuda-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00
  • rhtas/rekor-search-ui-rhel9 as a component of Red Hat Trusted Artifact Signer · known affected

    Vendor assessment for this product only.

    pkg:oci/rekor-search-ui-rhel9@sha256:7933b00020529ecbdfa107a238939773c9aa003cfa12e2236a2d397dc22acc52?repository_url=registry.redhat.io/rhtas/rekor-search-ui-rhel9

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-94486 · Updated 2026-10-05T16:49:08+00:00

Known Affected Software Configurations

VendorProductVersion range
VercelNext.Js≥ 16.0.0 and < 16.3.8

All CVSS metrics

  • LOW 2.3 v4.0 · CNA Primary
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
  • LOW 2.3 v4.0 · NVD Secondary
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • MEDIUM 5.4 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS