CVE-2026-45819 web-platform-dx CVE debrief

Who should care

Defenders who use baseline-browser-mapping 2.x before 2.11.0 should verify the version in use and upgrade to version 2.11.0 or later if necessary. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-45819 is a vulnerability in baseline-browser-mapping 2.x before 2.11.0 that can trigger immediate process termination, causing denial of service. Defenders should verify the version in use and upgrade to version 2.11.0 or later if necessary.

• Denial of service attacks may be possible
• Version verification and potential upgrades are required

Technical summary

The vulnerability is caused by the package calling process.exit() instead of throwing on invalid or conflicting input parameters, and can trigger immediate process termination, causing denial of service. The affected product is baseline-browser-mapping 2.x before 2.11.0. Defenders should prioritize verifying the version of baseline-browser-mapping in use and upgrading to version 2.11.0 or later if necessary. This issue does not have a known exploit, but defenders should review the official advisory for affected scope, severity, and vendor guidance.

Defensive priority

Defenders should prioritize verifying the version of baseline-browser-mapping in use and upgrading to version 2.11.0 or later if necessary.

Recommended defensive actions

• Verify the version of baseline-browser-mapping in use
• Upgrade to version 2.11.0 or later if necessary
• Monitor for potential denial of service attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by the package calling process.exit() instead of throwing on invalid or conflicting input parameters. Evidence is limited to the CVE record and NVD detail page. Defenders should verify the version of baseline-browser-mapping in use and review the official advisory for affected scope, severity, and vendor guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.