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Advisory record · GHSA-g35j-m5xg-vh3q

webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules

CVSS 5.3 MediumEPSS 0.0052 · 45th percentile

Published by the GitHub Advisory Database at 24 Jul 2026, 20:49 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/quic-go/webtransport-goGo<0.11.10.11.1
Identifiers
GHSA-g35j-m5xg-vh3q · CVE-2026-57497 · GO-2026-6099
Weakness (CWE)
CWE-770
Tags
Published
24 Jul 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The github.com/quic-go/webtransport-go Go package before 0.11.1 allocates memory for the full body of unknown WebTransport capsules instead of discarding them. A remote peer able to open a WebTransport session can send a large unknown capsule and exhaust memory on a client or server, causing a denial of service. Upgrade to version 0.11.1 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 45th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:14 UTC First seen by agentprime
  2. 31 Oct 2026, 14:14 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.