CVE-2026-49493
Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
05 Jun 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
shd101wyy · Markdown Preview EnhancedWant to know if your infrastructure is exposed to this?
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