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MEDIUM severity

IPv6 enabled on IPv4-only network interfacesGHSA-x84c-p2g9-rqv9

MEDIUMFix: moby/moby@7cef0d9

GHSA-x84c-p2g9-rqv9 is a medium-severity (CVSS 4.7) CWE-668 vulnerability in github.com/docker/docker. A fix is available for github.com/docker/docker — see the affected versions and patch details below.

Also known asCVE-2024-32473GO-2024-2737
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-x84c-p2g9-rqv9.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs29th percentile — riskier than 29% of all scored CVEsHighest risk
0.00%0.28%0.57%0.85%0.1%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/docker/docker

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

In 26.0.0 and 26.0.1, IPv6 is not disabled on network interfaces, including those belonging to networks where --ipv6=false.

Impact

A container with an ipvlan or macvlan interface will normally be configured to share an external network link with the host machine. Because of this direct access, with IPv6 enabled:

  • Containers may be able to communicate with other hosts on the local network over link-local IPv6 addresses.
  • If router advertisements are being broadcast over the local network, containers may get SLAAC-assigned addresses.
  • The interface will be a member of IPv6 multicast groups.

This means interfaces in IPv4-only networks present an unexpectedly and unnecessarily increased attack surface.

A container with an unexpected IPv6 address can do anything a container configured with an IPv6 address can do. That is, listen for connections on its IPv6 address, open connections to other nodes on the network over IPv6, or attempt a DoS attack by flooding packets from its IPv6 address. This has CVSS score AV:L/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L (2.7).

Because the container may not be constrained by an IPv6 firewall, there is increased potential for data exfiltration from the container. This has CVSS score AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N (4.7).

A remote attacker could send malicious Router Advertisements to divert traffic to itself, a black-hole, or another device. The same attack is possible today for IPv4 macvlan/ipvlan endpoints with ARP spoofing, TLS is commonly used by Internet APIs to mitigate this risk. The presence of an IPv6 route could impact the container's availability by indirectly abusing the behaviour of software which behaves poorly in a dual-stack environment. For example, it could resolve a name to a DNS AAAA record and keep trying to connect over IPv6 without ever falling back to IPv4, potentially denying service to the container. This has CVSS score AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (4.5).

Patches

The issue is patched in 26.0.2.

Workarounds

To completely disable IPv6 in a container, use --sysctl=net.ipv6.conf.all.disable_ipv6=1 in the docker create or docker run command. Or, in the service configuration of a compose file, the equivalent:

        sysctls:
            - net.ipv6.conf.all.disable_ipv6=1

References

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/docker/docker≥ 26.0.0&&< 26.0.226.0.2go get github.com/docker/docker@v26.0.2

Affected Products

1 product · 1 configurations
Application
mobymobyproject
≥ 26.0.0 && < 26.0.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/docker/docker, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/docker/docker to 26.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x84c-p2g9-rqv9 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

In 26.0.0 and 26.0.1, IPv6 is not disabled on network interfaces, including those belonging to networks where `--ipv6=false`. ### Impact A container with an `ipvlan` or `macvlan` interface will normally be configured to share an external network link with the host machine. Because of this direct access, with IPv6 enabled: - Containers may be able to communicate with other hosts on the local network over link-local IPv6 addresses. - If router advertisements are being broadcast over the local network, containers may get SLAAC-assigned addresses. - The interface will be a member of IPv6 multi
O3 Security · Impact-Aware SCA

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IPv6 enabled on IPv4-only network interfaces (Medium 4.7)