CVE-2026-0969 json
Arbitrary code execution in React server-side rendering of untrusted MDX content
published 8mo ago modified 4mo ago also EUVD-2026-7026 , GHSA-g4xw-jxrg-5f6m
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm next-mdx-remote 6.0.0
- HashiCorp Shared library 6.0.0
Is CVE-2026-0969 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 8mo ago
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | next-mdx-remote | >=4.3.0, <6.0.0 |
6.0.0 |
Affected products
- HashiCorp Shared library
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
-
github.com
/hashicorp/next-mdx-remote/commit/4d527fdcaed911b87f427d0b4d3c711e817fa4b3
web
-
discuss.hashicorp.com
/t/hcsec-2026-01-arbitrary-code-execution-in-react-server-side-rendering-of-untrusted-mdx-content/77155
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-0969
advisory
-
github.com
/hashicorp/next-mdx-remote
package
-
github.com
/hashicorp/next-mdx-remote/releases/tag/v6.0.0
web
Sources
- CVE List CVE-2026-0969
- GitHub Advisory GHSA-g4xw-jxrg-5f6m
- NVD CVE-2026-0969
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.