CVE-2026-93749source-map-js through 1.2.1 Event Loop Denial of Service
Updated under an hour ago ()
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It affects 7rulnik source-map-js. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-1284
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
7rulnik source-map-js 7rulnik:source_map_js (from the name) | through 1.2.1 | CNA record |
References
- https://github.com/7rulnik/source-map-js/issues/76issue-tracking
- https://github.com/7rulnik/source-map-jsproduct
- https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118technical-description
- https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-servicethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.