Incomplete Cleanup Affecting github.com/quic-go/webtransport-go package, versions <0.10.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMQUICGOWEBTRANSPORTGO-15279232
- published13 Feb 2026
- disclosed12 Feb 2026
- creditUnknown
Introduced: 12 Feb 2026
CVE-2026-21438 (opens in a new tab)How to fix?
Upgrade github.com/quic-go/webtransport-go to version 0.10.0 or higher.
Overview
Affected versions of this package are vulnerable to Incomplete Cleanup due to the improper cleanup of the streams map. An attacker can cause unbounded memory consumption by repeatedly creating and closing a large number of streams, leading to resource exhaustion.