Moderate severityNVD Advisory· Published Feb 12, 2026· Updated Feb 17, 2026
webtransport-go affected by a Memory Exhaustion Attack due to Missing Cleanup of Streams Map
CVE-2026-21438
Description
webtransport-go is an implementation of the WebTransport protocol. Prior to 0.10.0, an attacker can cause unbounded memory consumption repeatedly creating and closing many WebTransport streams. Closed streams were not removed from an internal session map, preventing garbage collection of their resources. This vulnerability is fixed in v0.10.0.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/quic-go/webtransport-goGo | < 0.10.0 | 0.10.0 |
Affected products
1- Range: < 0.10.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-2f2x-8mwp-p2gcghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-21438ghsaADVISORY
- github.com/quic-go/webtransport-go/releases/tag/v0.10.0ghsax_refsource_MISCWEB
- github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gcghsax_refsource_CONFIRMWEB
News mentions
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