CVE-2026-45819 baseline-browser-mapping process termination on invalid input causes denial of service
An attacker can cause immediate process termination and denial of service by providing invalid or conflicting input parameters to the baseline-browser-mapping library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45819?
CVE-2026-45819 is a medium-severity denial of service vulnerability in web-platform-dx baseline-browser-mapping, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-45819?
2 open source packages ship an affected version, including baseline-browser-mapping.
| Package | Affected | Fixed in |
|---|---|---|
baseline-browser-mapping npm | From 2.0.0 | 2.11.0 |
baseline-browser-mapping npm | From 2.0.0 | 2.11.0 |
How do I fix CVE-2026-45819?
Upgrade baseline-browser-mapping to 2.11.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-45819 being exploited?
There is no known exploitation of CVE-2026-45819 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-GC84062, CLEANSTART-2026-YT00725, CLSA-2026-1791198699, CLSA-2026-1791282757, CLSA-2026-1792163954, ECHO-04fe-7dc0-9e7c and 17 more.