Vulnerability · Published Dec 11, 2025 · Assigned by GitHub_M
CVE-2025-64702quic-go HTTP/3 QPACK Header Expansion DoS
Medium 5.3
In plain English
A medium-severity resource allocation without limits in quic-go from quic-go. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-lucas-clemente-quic-go | no fix listed | DEBIAN-CVE-2025-64702 |
| Debian:13 | golang-github-lucas-clemente-quic-go | no fix listed | DEBIAN-CVE-2025-64702 |
| Debian:14 | golang-github-lucas-clemente-quic-go | 0.59.0-1 | DEBIAN-CVE-2025-64702 |
| Go | github.com/quic-go/quic-go | 0.57.0 | GHSA-g754-hx8w-x2g6 |
| Go | github.com/quic-go/quic-go | 0.57.0 | GO-2025-4233 |
| Ubuntu:22.04:LTS | golang-github-lucas-clemente-quic-go | no fix listed | UBUNTU-CVE-2025-64702 |
| Ubuntu:24.04:LTS | golang-github-lucas-clemente-quic-go | no fix listed | UBUNTU-CVE-2025-64702 |
| Ubuntu:25.10 | golang-github-lucas-clemente-quic-go | no fix listed | UBUNTU-CVE-2025-64702 |
| Ubuntu:26.04:LTS | golang-github-lucas-clemente-quic-go | no fix listed | UBUNTU-CVE-2025-64702 |
| Ubuntu:26.10 | golang-github-lucas-clemente-quic-go | no fix listed | UBUNTU-CVE-2025-64702 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L