CVE-2025-64702: GO-2025-4233 - HTTP/3 QPACK Header Expansion DoS in github.com/quic-go/quic-go

CVE-2025-64702 · Severity: medium · CVSS 5.3 · Published 2025-12-11

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.

Technologies: github.com/quic-go/quic-go (Go). Vendors: Go.

Quick answers

Is CVE-2025-64702 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-64702 being exploited in the wild.
How severe is CVE-2025-64702?
Medium severity, with a CVSS score of 5.3, published 11 December 2025.
Which products and versions are affected?
github.com/quic-go/quic-go (Go) SEMVER:introduced=0,fixed=0.57.0.
Is there a fix for CVE-2025-64702?
Yes. github.com/quic-go/quic-go (Go): upgrade to 0.57.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-64702?
Check whether you run github.com/quic-go/quic-go (Go) or Quic-Go Project Quic-Go at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/quic-go/quic-go (Go): upgrade to 0.57.0 or later
    go get github.com/quic-go/quic-go@v0.57.0

Affected products

  • github.com/quic-go/quic-go (Go) SEMVER:introduced=0,fixed=0.57.0
  • Quic-Go Project Quic-Go

Identifiers

  • CVE-2025-64702
  • GHSA-g754-hx8w-x2g6
  • GO-2025-4233

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