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Vulnerability record · CVE-2026-21438 · published 12 February 2026

CVE-2026-21438: Quic-go webtransport-go memory leak vulnerability

Quic Go · Webtransport Go

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.

5.3 CVSS 3.1 Medium EPSS 0.38% · top 70.6% CWE-401 · Memory leakCWE-459 · CWE-459
5.3CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0 ProductRelease Notes
https://github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gc Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-21438), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.