Vulnerability DatabaseCVE-2026-21438
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CVE-2026-21438
February 12, 2026
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.
Affected Packages
github.com/quic-go/webtransport-go (GO):
Affected version(s) >=v0.0.0-20220605161545-1fcfed0aa8f2 <v0.10.0
Fix Suggestion:
Update to version v0.10.0
Related Resources (4)
https://github.com/quic-go/webtransport-go
https://nvd.nist.gov/vuln/detail/CVE-2026-21438
https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0
https://github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gc
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Missing Release of Memory after Effective Lifetime
CWE-401
Incomplete Cleanup
CWE-459
EPSS
Base Score:
0.02