CVE-2026-93749
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
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. Extremely large offset line values cause synchronous event loop blocking for extended periods, preventing the service from handling other requests.
Risk Assessment
An attacker can cause a denial of service (DoS) by blocking the application's event loop while processing malicious source maps. This can paralyze the service and prevent it from handling legitimate requests.
Recommendation
Update source-map-js to a version newer than 1.2.1 as soon as it becomes available, and consider validating the size and content of processed source maps.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

