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.

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Fixes

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Workaround

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History

Wed, 23 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1285
References
Metrics threat_severity

None

threat_severity

Important


Mon, 21 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared 7rulnik
7rulnik source-map-js
Vendors & Products 7rulnik
7rulnik source-map-js

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title source-map-js through 1.2.1 Event Loop Denial of Service
Weaknesses CWE-1284
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-22T15:16:59.380Z

Reserved: 2026-09-18T16:30:17.433Z

Link: CVE-2026-93749

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-18T18:18:33.480

Modified: 2026-09-22T20:25:55.870

Link: CVE-2026-93749

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-18T17:51:34Z

Links: CVE-2026-93749 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T01:45:19Z

Weaknesses