Skip to content
Fencer Vulns
medium 5.3

CVE-2025-64702 json

quic-go HTTP/3 QPACK Header Expansion DoS

published 2025-12-11 10 mo ago modified 2026-10-14 25 d ago also EUVD-2025-202714 , GHSA-g754-hx8w-x2g6 , GO-2025-4233

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/quic-go/quic-go 0.57.0
  • quic-go_project quic-go 0.57.0
  • quic_project quic 0.57.0
  • golang-github-lucas-clemente-quic-go Debian 14 0.59.0-1

debian advisories DEBIAN-CVE-2025-64702

  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1

suse advisories SUSE-SU-2026:0037-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • trivy openSUSE Tumbleweed 0.69.0-1.1
  • teleport openSUSE Tumbleweed 17.7.13-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:10131-1openSUSE-SU-2026:10035-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-64702 updated cvss 5.3

github.com/quic-go/quic-go/http3: quic-go HTTP/3 QPACK Header Expansion DoS

  • Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat OpenShift Service Mesh 2 openshift-service-mesh/pilot-rhel8, openshift-service-mesh/proxyv2-rhel9, openshift-service-mesh/istio-cni-rhel8 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9, openshift-service-mesh/istio-proxyv2-rhel9 Red Hat OpenShift Dev Spaces devspaces/traefik-rhel9
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/quic-go/quic-go
<0.57.0
0.57.0

Affected products

  • quic-go quic-go

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.