VULNERABILITY INTELLIGENCE

CVE-2026-49493

CVSS score8.8 HIGH
EPSS probability0.33%
CISA KEVNot currently listed
Published2026-06-05
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

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.

Weakness classification

  • disclosure@vulncheck.com: CWE-94

Primary references