CVE-2026-93749: 7rulnik Source-Map-Js

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• 7rulnik Source-Map-Js: up to and including 1.2.1

Published 2026-09-18. Last modified 2026-09-22.