CVE-2026-93749

EUVD-2026-83254
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 39.5%
Debian logo
Debian Releases
Debian Product
Codename
node-postcss
bookworm
postponed
forky
8.5.31+~cs10.2.26-1
fixed
sid
8.5.31+~cs10.2.26-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
node-postcss
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
stonking
needs-triage
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
firefox
Amazon Linux 2023
0:140.17.0-1.amzn2023.0.1
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.17.0-1.amzn2023.0.1
fixed
firefox-debugsource
Amazon Linux 2023
0:140.17.0-1.amzn2023.0.1
fixed
Common Weakness Enumeration
References
https://github.com/7rulnik/source-map-js
https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118
https://github.com/7rulnik/source-map-js/issues/76
https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service