CVE-2026-21438

MEDIUM EPSS 28.5%
Published Feb 12, 20264mo ago · Modified Jun 17, 20261w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Feb 12, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
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

Threat Intelligence

EPSS Exploit Probability
28.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-401
CWE-459

Affected Products 1

VendorProductVersionRange
quic-gowebtransport-go* <0.10.0

References 2

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.