CVE-2026-0969: Next mdx remote Next-mdx-remote Affected By Arbitrary Code Vulnerability

HIGH
Advisory Identifier: GHSA-g4xw-jxrg-5f6m
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CVSS 8.8
CWE-94
Published
Advisory Summary

CVE-2026-0969 is a HIGH (CVSS 8.8) next-mdx-remote affected by arbitrary code vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Next mdx remote libraries in the npm ecosystem. The issue involves next-mdx-remote affected by arbitrary code execution in react server-side rendering of untrusted mdx content. Remediation is available by upgrading affected packages to version 6.0.0.

CVE-2026-0969 at a Glance

CVE Identifier CVE-2026-0969
GHSA Identifier GHSA-g4xw-jxrg-5f6m
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Next mdx remote
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-0969

To remediate this vulnerability, upgrade all affected Next mdx remote dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

next-mdx-remote fixed: 6.0.0 
npm install next-mdx-remote@6.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls next-mdx-remote

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-0969, inspect your project dependencies using npm:

npm ls next-mdx-remote

Analyze the terminal output to locate any version of Next mdx remote in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.0.0), your application is affected.

Note: The npm ls next-mdx-remote command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Next mdx remote, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The serialize function used to compile MDX in next-mdx-remote is vulnerable to arbitrary code execution due to insufficient sanitization of MDX content.

CVE-2026-0969 Affected Next mdx remote Versions

1 component(s)
Fixed Versions:
6.0.0
Product / Package Ecosystem Affected Versions Fixed Version
next-mdx-remote
npm/next-mdx-remote
npm
≥ 4.3.0
< 6.0.0
6.0.0

References

NVD — CVE-2026-0969 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0969
Security Fix Commit FIX COMMIT
https://github.com/hashicorp/next-mdx-remote/commit/4d527fdcaed911b87f427d0b4d3c711e817fa4b3
discuss.hashicorp.com/t/hcsec-2026-01-arb... WEB
https://discuss.hashicorp.com/t/hcsec-2026-01-arbitrary-code-execution-in-react-server-side-rendering-of-untrusted-mdx-content/77155
Next mdx remote Source Repository REPOSITORY
https://github.com/hashicorp/next-mdx-remote
Next mdx remote Release RELEASE
https://github.com/hashicorp/next-mdx-remote/releases/tag/v6.0.0

Frequently Asked Questions

What is CVE-2026-0969?
CVE-2026-0969 is a security vulnerability in Next mdx remote involving next-mdx-remote affected by arbitrary code execution in React server-side rendering of untrusted MDX content under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Next mdx remote versions are affected?
Affected versions include releases prior to 6.0.0 across affected packages: next-mdx-remote.
What version fixes CVE-2026-0969?
Upgrading to 6.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is next-mdx-remote affected?
Yes, next-mdx-remote is affected in releases prior to 6.0.0. Upgrade your dependency to 6.0.0 or later.
What is the CVSS score of CVE-2026-0969?
CVE-2026-0969 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-0969?
CVE-2026-0969 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check npm dependencies for CVE-2026-0969?
Run the dependency tree command: 'npm ls next-mdx-remote'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g4xw-jxrg-5f6m",
  "modified" : "2026-02-24T14:20:56Z",
  "published" : "2026-02-12T03:31:01Z",
  "aliases" : [ "CVE-2026-0969" ],
  "summary" : "next-mdx-remote affected by arbitrary code execution in React server-side rendering of untrusted MDX content",
  "details" : "The serialize function used to compile MDX in next-mdx-remote is vulnerable to arbitrary code execution due to insufficient sanitization of MDX content.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "next-mdx-remote"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.3.0"
      }, {
        "fixed" : "6.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-0969"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/next-mdx-remote/commit/4d527fdcaed911b87f427d0b4d3c711e817fa4b3"
  }, {
    "type" : "WEB",
    "url" : "https://discuss.hashicorp.com/t/hcsec-2026-01-arbitrary-code-execution-in-react-server-side-rendering-of-untrusted-mdx-content/77155"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hashicorp/next-mdx-remote"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/next-mdx-remote/releases/tag/v6.0.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-24T14:20:55Z",
    "nvd_published_at" : "2026-02-12T03:15:46Z"
  }
}