PT-2026-47024 · Shd101Wyy · Markdown Preview Enhanced

Published 2026-06-05 · Updated 2026-06-05 · CVE-2026-49493

NVD

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS(), which evaluates the block content as code via vm.runInNewContext(), allowing arbitrary code execution. A crafted markdown document containing a malicious bitfield code block executes attacker-controlled code on the server side when the document is rendered or exported. Fixed in 0.8.28 by parsing bitfield register definitions with JSON5.parse(), since they are purely data.

Fix

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-49493

Affected Products

Markdown Preview Enhanced

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-49493 · Security Note
• https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28 · Note
• https://vulncheck.com/advisories/markdown-preview-enhanced-arbitrary-code-execution-via-bitfield-interpretjs · Note