CVE Catalog

CVE-2026-93749

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.35%

29th 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.

Related vulnerabilities

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