CVE-2026-93749CWE-1284

CVE-2026-93749

High · published September 18, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
26.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · 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
EPSS
0.00346 · 26.9th percentile
Weakness
CWE-1284 · Improper Validation of Specified Quantity in Input
Published
2026-09-18T22:18Z
References (4)
https://github.com/7rulnik/source-map-js · [email protected]https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118 · [email protected]https://github.com/7rulnik/source-map-js/issues/76 · [email protected]https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service · [email protected]
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 17:51Z
    source-map-js through 1.2.1 Event Loop Denial of Service
    cvelistv5