CVE-2026-45819: Baseline browser mapping Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-w5vr-8v7q-w6rv
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CWE-705
Published
Advisory Summary

CVE-2026-45819 is a MODERATE denial of service vulnerability (CWE-705: Incorrect Control Flow Scoping) affecting Baseline browser mapping libraries in the npm ecosystem. The issue involves baseline-browser-mapping process termination on invalid input causes denial of service. Remediation is available by upgrading affected packages to version 2.11.0.

CVE-2026-45819 at a Glance

CVE Identifier CVE-2026-45819
GHSA Identifier GHSA-w5vr-8v7q-w6rv
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-705: Incorrect Control Flow Scoping
Affected Product Baseline browser mapping
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-45819

To remediate this vulnerability, upgrade all affected Baseline browser mapping dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

baseline-browser-mapping fixed: 2.11.0 
npm install baseline-browser-mapping@2.11.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls baseline-browser-mapping

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-45819, inspect your project dependencies using npm:

npm ls baseline-browser-mapping

Analyze the terminal output to locate any version of Baseline browser mapping in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.11.0), your application is affected.

Note: The npm ls baseline-browser-mapping command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-705: Incorrect Control Flow Scoping, where the product does not properly return control flow to the proper location after it has completed a task or detected an unusual condition. In Baseline browser mapping, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

baseline-browser-mapping 2.x before 2.11.0 calls process.exit() instead of throwing on invalid or conflicting input parameters, and can trigger immediate process termination, causing denial of service.

CVE-2026-45819 Affected Baseline browser mapping Versions

1 component(s)
Fixed Versions:
2.11.0
Product / Package Ecosystem Affected Versions Fixed Version
baseline-browser-mapping
npm/baseline-browser-mapping
npm
≥ 2.0.0
< 2.11.0
2.11.0

References

NVD — CVE-2026-45819 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45819
Baseline browser mapping Source Repository REPOSITORY
https://github.com/web-platform-dx/baseline-browser-mapping/pull/137
Baseline browser mapping Source Repository REPOSITORY
https://github.com/web-platform-dx/baseline-browser-mapping/pull/137/changes#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519
Security Fix Commit FIX COMMIT
https://github.com/web-platform-dx/baseline-browser-mapping/commit/de733e2d8959559f7bb255d5927f3afcb6f31589
Baseline browser mapping Source Repository REPOSITORY
https://github.com/web-platform-dx/baseline-browser-mapping
Baseline browser mapping Source Repository REPOSITORY
https://github.com/web-platform-dx/baseline-browser-mapping/blob/b7881aa61c8a057e24468ab5ee18c5ecedbbf691/src/index.ts#L142
Baseline browser mapping Release RELEASE
https://github.com/web-platform-dx/baseline-browser-mapping/releases/tag/v2.11.0
www.npmjs.com/package/baseline-br... WEB
https://www.npmjs.com/package/baseline-browser-mapping

Frequently Asked Questions

What is CVE-2026-45819?
CVE-2026-45819 is a security vulnerability in Baseline browser mapping involving baseline-browser-mapping process termination on invalid input causes denial of service under CWE-705: Incorrect Control Flow Scoping.
Which Baseline browser mapping versions are affected?
Affected versions include releases prior to 2.11.0 across affected packages: baseline-browser-mapping.
What version fixes CVE-2026-45819?
Upgrading to 2.11.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is baseline-browser-mapping affected?
Yes, baseline-browser-mapping is affected in releases prior to 2.11.0. Upgrade your dependency to 2.11.0 or later.
What CWE is associated with CVE-2026-45819?
CVE-2026-45819 is classified under CWE-705: Incorrect Control Flow Scoping (The product does not properly return control flow to the proper location after it has completed a task or detected an unusual condition.).
How can I check npm dependencies for CVE-2026-45819?
Run the dependency tree command: 'npm ls baseline-browser-mapping'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w5vr-8v7q-w6rv",
  "modified" : "2026-09-08T20:41:21Z",
  "published" : "2026-08-13T12:31:09Z",
  "aliases" : [ "CVE-2026-45819" ],
  "summary" : "baseline-browser-mapping process termination on invalid input causes denial of service",
  "details" : "baseline-browser-mapping 2.x before 2.11.0 calls process.exit() instead of throwing on invalid or conflicting input parameters, and can trigger immediate process termination, causing denial of service.",
  "severity" : [ {
    "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/E:U/S:N/AU:Y/R:U/V:D/RE:M/U:Amber"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "baseline-browser-mapping"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.11.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-45819"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/web-platform-dx/baseline-browser-mapping/pull/137"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/web-platform-dx/baseline-browser-mapping/pull/137/changes#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/web-platform-dx/baseline-browser-mapping/commit/de733e2d8959559f7bb255d5927f3afcb6f31589"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/web-platform-dx/baseline-browser-mapping"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/web-platform-dx/baseline-browser-mapping/blob/b7881aa61c8a057e24468ab5ee18c5ecedbbf691/src/index.ts#L142"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/web-platform-dx/baseline-browser-mapping/releases/tag/v2.11.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/baseline-browser-mapping"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-705" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-08T20:41:21Z",
    "nvd_published_at" : "2026-08-13T12:17:23Z"
  }
}