CVE-2026-21438

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/12/2026

Last Modified2/19/2026

Sourcenvd

Honeypot Sightings0

Affected Products

quic-go:webtransport-go

Weaknesses (CWE)

CWE-401CWE-459

References

https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0(security-advisories@github.com)

https://github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gc(security-advisories@github.com)

IOC Correlations

No correlations recorded

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