High severity · published Feb 12, 2026
CVE-2026-0969
Arbitrary code execution in React server-side rendering of untrusted MDX content
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SL
Shared library · HashiCorp
4.3.0 before 6.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0969
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0969
discuss.hashicorp.com
https://discuss.hashicorp.com/t/hcsec-2026-01-arbitrary-code-execution-in-react-server-side-rendering-of-untrusted-mdx-content/77155
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