CVE-2026-0969 PUBLISHED

Arbitrary code execution in React server-side rendering of untrusted MDX content

Assigner: HashiCorp
Reserved: 14.01.2026 Published: 12.02.2026 Updated: 12.02.2026

The serialize function used to compile MDX in next-mdx-remote is vulnerable to arbitrary code execution due to insufficient sanitization of MDX content. This vulnerability, CVE-2026-0969, is fixed in next-mdx-remote 6.0.0.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	HashiCorp
Product	Shared library
Versions	Default: unaffected affected from 4.3.0 to 6.0.0 (excl.)

References

https://discuss.hashicorp.com/t/hcsec-2026-01-arbitrary-code-execution-in-react-server-side-rendering-of-untrusted-mdx-content/77155

Problem Types

CWE-94: Improper Control of Generation of Code (Code Injection) CWE

Impacts

CAPEC-242: Code Injection