CVE-2026-57497webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules
Updated under an hour ago ()
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It affects quic-go webtransport-go. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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webtransport-go is an implementation of the WebTransport protocol. Prior to 0.11.1, Session.parseNextCapsule() in session.go skips an unknown WebTransport capsule on the HTTP/3 request stream by calling io.ReadAll on the capsule reader, retaining the complete declared capsule body in memory. A malicious peer can send a large unknown capsule and cause a client or server to allocate memory for the full payload; QUIC flow control does not bound the total retained allocation because reading advances the flow-control window while the received bytes remain in memory. The resulting memory and resource exhaustion can disrupt or crash the affected process. This issue is fixed in version 0.11.1.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
quic-go webtransport-go quic_go:webtransport_go (from the name) | before 0.11.1 | CNA record |
References
- https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g35j-m5xg-vh3qx-refsource-confirm
- https://github.com/quic-go/webtransport-go/pull/290x-refsource-misc
- https://github.com/quic-go/webtransport-go/commit/3aecd11736579530ff067651c30a543eb0b4b8c4x-refsource-misc
- https://github.com/quic-go/webtransport-go/releases/tag/v0.11.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.