High severity7.5NVD Advisory· Published Sep 18, 2026· Updated Sep 22, 2026
CVE-2026-93749
CVE-2026-93749
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
source-map-jsnpm | >= 1.0.0, < 1.2.2 | 1.2.2 |
Affected products
1- Range: <=1.2.1
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-68fv-2mgg-jv7qghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-93749ghsaADVISORY
- github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.jsnvdWEB
- github.com/7rulnik/source-map-js/commit/cf7658058ceeaa8619d5ae0ec90be6905209d016ghsaWEB
- github.com/7rulnik/source-map-js/issues/76nvdWEB
- github.com/7rulnik/source-map-js/pull/79ghsaWEB
- github.com/7rulnik/source-map-js/releases/tag/v1.2.2ghsaWEB
- www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-servicenvdWEB
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