What is CVE-2026-93749?

CVE-2026-93749 is a high-severity vulnerability in 7rulnik Source-Map-Js, classified under Improper Validation of Specified Quantity in Input. CVSS score: 7.5/10. Published 2026-09-18.

How severe is CVE-2026-93749?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in 7rulnik Source-Map-Js

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 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

7rulnik Source-map-js

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-93749?: CVE-2026-93749 is a high-severity vulnerability in 7rulnik Source-Map-Js, classified under Improper Validation of Specified Quantity in Input. CVSS score: 7.5/10. Published 2026-09-18.
How severe is CVE-2026-93749?: High severity. CVSS v3 base score is 7.5 out of 10.