CVE-2026-93749

source-map-js through 1.2.1 fails to validate the per-section offset line value in indexed source maps, allowing attackers to specify arbitrary numeric values. Attackers can supply extremely large offset line values that cause synchronous event loop blocking for extended periods, preventing the service from handling other requests.

  • Published Sep 18, 2026
  • CVSS 8.7 high
  • 0.6% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-93749 at the National Vulnerability Database