{"id":"CVE-2026-57497","revision":"e5f1ac64713045889fc92c77665f1e67","records":[{"revision":"e5f1ac64713045889fc92c77665f1e67","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-57497","aliases":[],"title":"webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules","description":"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.","state":0,"publishedAt":"2026-09-14T16:05:31.661+00:00","modifiedAt":"2026-09-14T20:06:48.086+00:00","affected":[{"ecosystem":"Vendor product","name":"webtransport-go","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"quic-go\",\n                    \"product\": \"webtransport-go\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.11.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g35j-m5xg-vh3q","https://github.com/quic-go/webtransport-go/pull/290","https://github.com/quic-go/webtransport-go/commit/3aecd11736579530ff067651c30a543eb0b4b8c4","https://github.com/quic-go/webtransport-go/releases/tag/v0.11.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57497","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-57497","identifiers":["CVE-2026-57497"]},"retained":false,"historicalAffected":[]}],"coverage":[]}