GHSA-68fv-2mgg-jv7q

Suggest an improvement
Source
https://github.com/advisories/GHSA-68fv-2mgg-jv7q
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-68fv-2mgg-jv7q/GHSA-68fv-2mgg-jv7q.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-68fv-2mgg-jv7q
Aliases
Downstream
CGA (165)
MINI (7)
Published
2026-09-18T18:31:44Z
Modified
2026-10-05T23:45:07Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
source-map-js allows event-loop denial of service through indexed source-map section offsets
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.

Database specific 
{
    "cwe_ids": [
        "CWE-1284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T23:31:22Z",
    "nvd_published_at": "2026-09-18T18:18:33Z",
    "severity": "HIGH"
}
References

Affected packages

npm / source-map-js

Package

Name
source-map-js
View open source insights on deps.dev
Purl
pkg:npm/source-map-js

Affected ranges

Type
SEMVER
Events
Introduced
1.0.0
Fixed
1.2.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-68fv-2mgg-jv7q/GHSA-68fv-2mgg-jv7q.json"