CVE-2026-21438 MEDIUM

CVE-2026-21438: webtransport-go affected by a Memory Exhaustion Attack due to Missing Cleanup of Streams Map

Vendor Quic-Go
Product webtransport-go
Weakness CWE-401
Published February 12, 2026
Last update February 17, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 12, 2026 CVE published
February 17, 2026 Record updated