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CVE-2026-21438

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-21438

Severity

5.3

Medium

CVSS V3

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Summary

webtransport-go affected by a Memory Exhaustion Attack due to Missing Cleanup of Streams Map

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.

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