CVE-2026-93749
source-map-js through 1.2.1 Event Loop Denial of Service
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 18, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
source-map-js7rulnik |
|
References
- GitHub Issue #76issue-tracking
- https://github.com/7rulnik/source-map-jsproduct
- line-padding loop driven by the unvalidated section offset linetechnical-description
- VulnCheck Advisory: source-map-js through 1.2.1 Event Loop Denial of Servicethird-party-advisory
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