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Fencer Vulns
medium 6.4

CVE-2023-49295 json

quic-go's path validation mechanism can cause denial of service

published 2024-01-10 2 y ago modified 2026-09-10 1 mo ago also GHSA-ppxx-5m9h-6vxf , GO-2024-2459 , EUVD-2024-0394

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

quic-go is an implementation of the QUIC protocol (RFC 9000, RFC 9001, RFC 9002) in Go. An attacker can cause its peer to run out of memory sending a large number of PATH_CHALLENGE frames. The receiver is supposed to respond to each PATH_CHALLENGE frame with a PATH_RESPONSE frame. The attacker can prevent the receiver from sending out (the vast majority of) these PATH_RESPONSE frames by collapsing the peers congestion window (by selectively acknowledging received packets) and by manipulating the peer's RTT estimate. This vulnerability has been patched in versions 0.37.7, 0.38.2 and 0.39.4.

Patch / fix

  • go github.com/quic-go/quic-go 0.37.7, 0.38.2, 0.39.4, 0.40.1
  • quic-go_project quic-go 0.37.7, 0.38.2, 0.39.4
  • golang-github-lucas-clemente-quic-go Debian 14, Debian 13 0.38.2-1

debian advisories DEBIAN-CVE-2023-49295

  • receptor ansible automation platform inside 2.4, ansible automation platform developer 2.4, ansible automation platform 2.4 1.4.4-1.el8ap
  • receptor ansible automation platform inside 2.4, ansible automation platform developer 2.4, ansible automation platform 2.4 1.4.4-1.el9ap

red hat advisories RHSA-2024:0855

  • dnscrypt-proxy openSUSE Leap 16.0 2.1.16-bp160.1.1
  • kubo openSUSE Tumbleweed 0.32.1-1.1

opensuse advisories openSUSE-RU-2026:21160-1openSUSE-SU-2025:14626-1

  • coredns CBL-Mariner 2.0 1.11.1-5
  • coredns Azure Linux 3.0 1.11.1-2

azure linux advisories AZL-33285AZL-34627

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-49295 updated cvss 6.5

quic-go: memory exhaustion attack against QUIC's path validation mechanism

  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/istio-cni-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat Advanced Cluster Management for Kubernetes 2 volsync-container, rhacm2/lighthouse-agent-rhel9, rhacm2/volsync-mover-rclone-rhel8, rhacm2/volsync-mover-syncthing-rhel8 Red Hat OpenShift Container Platform 4 openshift4/ose-coredns-rhel9
    affected: no fix available
  • Red Hat OpenShift Dev Spaces devspaces/traefik-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2.4 for RHEL 8 receptor 1.4.4-1.el8ap Red Hat Ansible Automation Platform 2.4 for RHEL 9 receptor 1.4.4-1.el9ap
    fixed: vendor fix RHSA-2024:0855
  • Red Hat OpenShift API for Data Protection oadp/oadp-velero-plugin-for-vsm-rhel8, oadp/oadp-volume-snapshot-mover-rhel8 Red Hat Ansible Automation Platform 2.4 for RHEL 8 receptorctl 1.4.4-1.el8ap Red Hat Ansible Automation Platform 2.4 for RHEL 9 receptorctl 1.4.4-1.el9ap
    not affected: vulnerable code not present

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
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.20% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 6.4 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

Affected packages

ecosystem package affected fixed in
go github.com/quic-go/quic-go
>=0.40.0, <0.40.1
>=0.39.0, <0.39.4
>=0.38.0, <0.38.2
<0.37.7
0.40.1
0.39.4
0.38.2
0.37.7

Affected products

  • quic-go quic-go

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.