{"id":"CVE-2026-49493","title":"Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()","summary":"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 …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-94"],"vendor":"shd101wyy","product":"Markdown Preview Enhanced","affected":["markdown_preview_enhanced < 0.8.28"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-09T14:11:41.871600Z"},"published":"2026-06-05","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:04:54.235Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-49493","references":[{"url":"https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28","label":"Markdown Preview Enhanced 0.8.28 Release Notes"},{"url":"https://www.vulncheck.com/advisories/markdown-preview-enhanced-arbitrary-code-execution-via-bitfield-interpretjs","label":"VulnCheck Advisory: Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()"}],"tags":["cve.org"],"epss":0.00327,"epssPercentile":0.25927,"ingestedAt":"2026-11-08T14:51:22.387Z","slug":"CVE-2026-49493","body":"## Overview\n\nMarkdown 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.\n\n## Affected\n\n- `markdown_preview_enhanced < 0.8.28`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}