Vulnerability Details CVE-2026-21438
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.6%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-21438
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cpe:2.3:a:quic-go:webtransport-go:0.1.0
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cpe:2.3:a:quic-go:webtransport-go:0.1.1
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cpe:2.3:a:quic-go:webtransport-go:0.2.0
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cpe:2.3:a:quic-go:webtransport-go:0.3.0
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cpe:2.3:a:quic-go:webtransport-go:0.4.0
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cpe:2.3:a:quic-go:webtransport-go:0.4.1
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cpe:2.3:a:quic-go:webtransport-go:0.4.2
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cpe:2.3:a:quic-go:webtransport-go:0.4.3
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cpe:2.3:a:quic-go:webtransport-go:0.5.0
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cpe:2.3:a:quic-go:webtransport-go:0.5.1
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cpe:2.3:a:quic-go:webtransport-go:0.5.2
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cpe:2.3:a:quic-go:webtransport-go:0.5.3
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cpe:2.3:a:quic-go:webtransport-go:0.6.0
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cpe:2.3:a:quic-go:webtransport-go:0.7.0
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cpe:2.3:a:quic-go:webtransport-go:0.8.0
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cpe:2.3:a:quic-go:webtransport-go:0.9.0