CVE-2026-93749— source-map-js through 1.2.1 Event Loop Denial of Service
Quick assessment
Affected
7rulnik source-map-js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 f
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 7rulnik | source-map-js | ≤ 1.2.1 |
affected |
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I. Basic Information for CVE-2026-93749
Vulnerability Information
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Vulnerability Title
source-map-js through 1.2.1 Event Loop Denial of Service
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| 7rulnik | source-map-js | 0 ~ 1.2.1 | - |
|
II. Public POCs for CVE-2026-93749
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-93749 (3)
-
source-map-js through 1.2.1 Event Loop Denial of Service | Advisories | VulnCheck third-party-advisory
IV. Related Vulnerabilities
Same weakness: CWE-1284
V. Comments for CVE-2026-93749
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