{"id":"UBUNTU-CVE-2026-93749","details":"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.","modified":"2026-09-21T21:40:59.441834581Z","published":"2026-09-21T00:00:00Z","upstream":["CVE-2026-93749"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-93749"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-93749"},{"type":"REPORT","url":"https://github.com/7rulnik/source-map-js/issues/76"},{"type":"REPORT","url":"https://github.com/7rulnik/source-map-js"},{"type":"REPORT","url":"https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service"}],"affected":[{"package":{"name":"node-postcss","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-postcss?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.23-1","6.0.23-3"],"ecosystem_specific":{"binaries":[{"binary_version":"6.0.23-3","binary_name":"node-postcss"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93749.json"}},{"package":{"name":"node-postcss","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-postcss?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.2.1+~cs5.3.23-8","8.4.5+~cs7.1.51-2","8.4.6+~cs7.3.21-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-postcss","binary_version":"8.4.6+~cs7.3.21-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93749.json"}},{"package":{"name":"node-postcss","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-postcss?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.20+~cs8.0.23-1","8.4.31+~cs8.0.26-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-postcss","binary_version":"8.4.31+~cs8.0.26-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93749.json"}},{"package":{"name":"node-postcss","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-postcss?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.5.6+~cs9.3.28-1","8.5.8+~cs9.3.30-1"],"ecosystem_specific":{"binaries":[{"binary_version":"8.5.8+~cs9.3.30-1","binary_name":"node-postcss"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93749.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}