SB2026110206 - Improper Validation of Specified Quantity in Input in source-map-js

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Validation of Specified Quantity in Input (CVE-ID: CVE-2026-93749)

CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input

CVSSv4: 8.7 [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]

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to source-map-js to validate the per-section offset line value in indexed source maps. A remote attacker can supply extremely large offset line values that cause synchronous event loop blocking for extended periods, preventing the service from handling other requests.

Remediation

Install update from vendor's website.

References

• 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