{"cve":"CVE-2026-57497","nvd":{"published":"2026-09-14T17:17:49.097","modified":"2026-09-30T17:51:56.193","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-770"],"references":["https://github.com/quic-go/webtransport-go/commit/3aecd11736579530ff067651c30a543eb0b4b8c4","https://github.com/quic-go/webtransport-go/pull/290","https://github.com/quic-go/webtransport-go/releases/tag/v0.11.1","https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g35j-m5xg-vh3q"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-57497","score":0.00524,"percentile":0.4414,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-g35j-m5xg-vh3q","url":"https://osv.dev/vulnerability/GHSA-g35j-m5xg-vh3q","summary":"webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules","modified":"2026-09-10T03:50:51.904067409Z","packages":[{"ecosystem":"Go","name":"github.com/quic-go/webtransport-go","purl":"pkg:golang/github.com/quic-go/webtransport-go","ranges":["<0.11.1"],"fixed":["0.11.1"]}]},{"id":"GO-2026-6099","url":"https://osv.dev/vulnerability/GO-2026-6099","summary":"webtransport-go: Memory Exhaustion Attack due to Buffering of Unknown Capsules in github.com/quic-go/webtransport-go","modified":"2026-08-18T15:00:16.039853204Z","packages":[{"ecosystem":"Go","name":"github.com/quic-go/webtransport-go","purl":"pkg:golang/github.com/quic-go/webtransport-go","ranges":["<0.11.1"],"fixed":["0.11.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}