{"id":"CVE-2025-64702","aliases":["GHSA-g754-hx8w-x2g6","GO-2025-4233"],"url":"https://o3.security/vulnerability/CVE-2025-64702","summary":"quic-go HTTP/3 QPACK Header Expansion DoS","details":"quic-go is an implementation of the QUIC protocol in Go. Versions 0.56.0 and below are vulnerable to excessive memory allocation through quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large header field section (many unique header names and/or large values). The implementation builds an http.Header (used on the http.Request and http.Response, respectively), while only enforcing limits on the size of the (QPACK-compressed) HEADERS frame, but not on the decoded header, leading to memory exhaustion. This issue is fixed in version 0.57.0.","published":"2025-12-11T20:58:10.517Z","modified":"2026-08-12T03:51:14.756335676Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/quic-go/quic-go","fixedVersion":"0.57.0"}],"fix":{"url":"https://github.com/quic-go/quic-go/commit/5b2d2129f8315da41e01eff0a847ab38a34e83a8","label":"quic-go/quic-go@5b2d212"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/64xxx/CVE-2025-64702.json"},{"type":"ADVISORY","url":"https://github.com/quic-go/quic-go/security/advisories/GHSA-g754-hx8w-x2g6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-64702"},{"type":"FIX","url":"https://github.com/quic-go/quic-go/commit/5b2d2129f8315da41e01eff0a847ab38a34e83a8"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:14.756335676Z"}}