CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2026-21438
Medium (5.3) in quic-go webtransport-go. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/quic-go/webtransport-go 0.10.0.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-401, CWE-459
- Published
- Modified
- Record from
- the NVD, synced
Affected
- quic-go:webtransport-go
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-2f2x-8mwp-p2gc | Go | github.com/quic-go/webtransport-go | <0.10.0 | 0.10.0 |
| GO-2026-4483 | Go | github.com/quic-go/webtransport-go | <0.10.0 | 0.10.0 |