Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/7rulnik/source-map-js
- https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82
- https://github.com/7rulnik/source-map-js/issues/76
- https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-deni
FAQ
What is CVE-2026-93749?
CVE-2026-93749 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 off...
How severe is CVE-2026-93749?
CVE-2026-93749 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93749?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.