Answer in brief
CVE-2026-49493 records a High severity (CVSS 8.6) vulnerability in Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS(). The current sources do not mark it as known exploited. The current feed maps shd101wyy/Markdown Preview Enhanced (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps shd101wyy/Markdown Preview Enhanced (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| shd101wyy/Markdown Preview Enhancedgeneric | >=0 <0.8.28 | 0.8.28 |
Published upstream
Jun 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.