Allocation of Resources Without Limits or Throttling Affecting github.com/quic-go/webtransport-go package, versions >=0.3.0 <0.10.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published13 Feb 2026
- disclosed12 Feb 2026
- creditUnknown
Introduced: 12 Feb 2026
CVE-2026-21434 (opens in a new tab)How to fix?
Upgrade github.com/quic-go/webtransport-go to version 0.10.0 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to missing length validation in the WT_CLOSE_SESSION capsule parser. An attacker can exhaust system memory by sending a capsule with an excessively large Application Error Message payload, which is fully read and stored in memory without restriction.