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CVE-2026-93749

CVE-2026-93749 · source-map-js through 1.2.1 Event Loop Denial of Service

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 8.7 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • source-map-js

    Versions
    • ≥ 0, ≤ 1.2.1: Affected (semver)

    No fix published

  • node-postcss Debian:12

    Versions
    • 8.4.20+~cs8.0.23-1
    • 8.4.20+~cs8.0.23-1+deb12u1
    • 8.4.31+~cs8.0.26-1
    • 8.4.39+~cs9.2.29-1
    • 8.4.49+~cs9.2.32-1
    • 8.5.12+~cs9.3.32-1
    • 8.5.14+~cs9.3.34-1
    • 8.5.15+~cs9.3.34-1
    • 8.5.15+~cs9.3.38-1
    • 8.5.15+~cs9.3.39-1
    • 8.5.19+~cs10.2.23-1
    • 8.5.21+~cs10.2.23-1
    • 8.5.23+~cs10.2.23-1
    • 8.5.25+~cs10.2.23-1
    • 8.5.26+~cs10.2.24-1
    • 8.5.28+~cs10.2.24-1
    • 8.5.31+~cs10.2.26-1
    • 8.5.6+~cs9.3.28-1
    • 8.5.8+~cs9.3.30-1
    • 8.5.9+~cs9.3.30-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-postcss Debian:13

    Versions
    • 8.4.49+~cs9.2.32-1
    • 8.5.12+~cs9.3.32-1
    • 8.5.14+~cs9.3.34-1
    • 8.5.15+~cs9.3.34-1
    • 8.5.15+~cs9.3.38-1
    • 8.5.15+~cs9.3.39-1
    • 8.5.19+~cs10.2.23-1
    • 8.5.21+~cs10.2.23-1
    • 8.5.23+~cs10.2.23-1
    • 8.5.25+~cs10.2.23-1
    • 8.5.26+~cs10.2.24-1
    • 8.5.28+~cs10.2.24-1
    • 8.5.31+~cs10.2.26-1
    • 8.5.6+~cs9.3.28-1
    • 8.5.8+~cs9.3.30-1
    • 8.5.9+~cs9.3.30-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-postcss Debian:14

    Versions
    • 8.4.49+~cs9.2.32-1
    • 8.5.12+~cs9.3.32-1
    • 8.5.14+~cs9.3.34-1
    • 8.5.15+~cs9.3.34-1
    • 8.5.15+~cs9.3.38-1
    • 8.5.15+~cs9.3.39-1
    • 8.5.19+~cs10.2.23-1
    • 8.5.21+~cs10.2.23-1
    • 8.5.23+~cs10.2.23-1
    • 8.5.25+~cs10.2.23-1
    • 8.5.26+~cs10.2.24-1
    • 8.5.28+~cs10.2.24-1
    • 8.5.6+~cs9.3.28-1
    • 8.5.8+~cs9.3.30-1
    • 8.5.9+~cs9.3.30-1
    Affected ranges
    • ECOSYSTEM: < 8.5.31+~cs10.2.26-1

    Update to 8.5.31+~cs10.2.26-1

  • source-map-js npm

    Affected ranges
    • SEMVER: ≥ 1.0.0, < 1.2.2

    Update to 1.2.2

  • node-postcss Ubuntu:20.04:LTS

    Versions
    • 6.0.23-1
    • 6.0.23-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-postcss Ubuntu:22.04:LTS

    Versions
    • 8.2.1+~cs5.3.23-8
    • 8.4.5+~cs7.1.51-2
    • 8.4.6+~cs7.3.21-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-postcss Ubuntu:24.04:LTS

    Versions
    • 8.4.20+~cs8.0.23-1
    • 8.4.31+~cs8.0.26-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-postcss Ubuntu:26.10

    Versions
    • 8.5.8+~cs9.3.30-1
    • 8.5.15+~cs9.3.34-1
    • 8.5.15+~cs9.3.38-1
    • 8.5.15+~cs9.3.39-1build1
    • 8.5.25+~cs10.2.23-1
    • 8.5.26+~cs10.2.24-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-postcss Ubuntu:26.04:LTS

    Versions
    • 8.5.6+~cs9.3.28-1
    • 8.5.8+~cs9.3.30-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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