CVE-2026-93749

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/7rulnik/source-map-js
https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118
https://github.com/7rulnik/source-map-js/issues/76
https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service

Configurations

No configuration.

History

18 Sep 2026, 18:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-18 18:18

Updated : 2026-09-22 20:25

NVD link : CVE-2026-93749

Mitre link : CVE-2026-93749

CVE.ORG link : CVE-2026-93749

JSON object : View

Products Affected

No product.

CWE

CWE-1284

Improper Validation of Specified Quantity in Input

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