CVE-2026-21438

MEDIUM
2026-02-12 [email protected] GHSA-2f2x-8mwp-p2gc
5.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 12, 2026 - 19:15 nvd
MEDIUM 5.3

Tags

Golang Webtransport Go Suse

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.

Analysis

Webtransport-go versions prior to 0.10.0 fail to properly clean up closed WebTransport streams from internal session maps, allowing remote attackers to exhaust server memory through repeated stream creation and closure. This denial-of-service condition requires no authentication or user interaction and affects all deployments using the vulnerable library. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +26
POC: 0

Vendor Status

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CVE-2026-21438 vulnerability details – vuln.today
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