Kibana 9.x.x gives error 500 over IPv6

[AllRWeak]

Kibana version:
docker.elastic.co/kibana/kibana:9.1.4

Elasticsearch version:
docker.elastic.co/elasticsearch/elasticsearch:9.1.4

Server OS version:
PRETTY_NAME="Ubuntu 24.04.3 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.3 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo

Browser version:
Firefox 143.0.1

Browser OS version:
PRETTY_NAME="Ubuntu 24.04.3 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.3 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo

Original install method (e.g. download page, yum, from source, etc.):
Docker images

Describe the bug:
On pre-9.x.x Kibana (for an example 8.19.4) it was possible to set server.host: "::" in kibana.yml and Kibana would listen on both IPv4 and IPv6 addresses. The same config on Kibana 9.1.4 gives an error 300 in browser and Invalid URL error in Kibana container logs.

Steps to reproduce:

1. Set server.host: "::" in kibana.yml
2. Try accessing Kibana over IPv6 (either directly or using an AAAA-only DNS records)

Expected behavior:
It might not be the same config but I would expect that dual-stack or IPv6 only support would be available for Kibana.

Provide logs and/or server output (if relevant):
Container error:

[2025-09-24T20:29:45.766+00:00][ERROR][http.server.Kibana] TypeError: Invalid URL
    at new URL (node:internal/url:818:25)
    at Request._parseUrl (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:187:25)
    at Request.get url [as url] (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:121:21)
    at new CoreKibanaRequest (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:138:40)
    at Function.from (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:65:12)
    at interceptPreRoutingRequest (/usr/share/kibana/node_modules/@kbn/core-http-server-internal/src/lifecycle/on_pre_routing.js:51:79)
    at exports.Manager.execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/toolkit.js:57:29)
    at Request._invoke (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:397:55)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at Request._onRequest (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:289:30)
    at Request._execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:271:13)
[2025-09-24T20:29:45.767+00:00][ERROR][http.server.Kibana] TypeError: Invalid URL
    at new URL (node:internal/url:818:25)
    at Request._parseUrl (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:187:25)
    at Request.get url [as url] (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:121:21)
    at new CoreKibanaRequest (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:138:40)
    at Function.from (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:65:12)
    at interceptPreResponse (/usr/share/kibana/node_modules/@kbn/core-http-server-internal/src/lifecycle/on_pre_response.js:59:81)
    at exports.Manager.execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/toolkit.js:57:29)
    at Request._invoke (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:397:55)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at Request._postCycle (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:468:32)
    at Request._reply (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:447:9)
[2025-09-24T20:29:45.816+00:00][ERROR][http.server.Kibana] TypeError: Invalid URL
    at new URL (node:internal/url:818:25)
    at Request._parseUrl (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:187:25)
    at Request.get url [as url] (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:121:21)
    at new CoreKibanaRequest (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:138:40)
    at Function.from (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:65:12)
    at interceptPreRoutingRequest (/usr/share/kibana/node_modules/@kbn/core-http-server-internal/src/lifecycle/on_pre_routing.js:51:79)
    at exports.Manager.execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/toolkit.js:57:29)
    at Request._invoke (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:397:55)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at Request._onRequest (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:289:30)
    at Request._execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:271:13)
[2025-09-24T20:29:45.817+00:00][ERROR][http.server.Kibana] TypeError: Invalid URL
    at new URL (node:internal/url:818:25)
    at Request._parseUrl (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:187:25)
    at Request.get url [as url] (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:121:21)
    at new CoreKibanaRequest (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:138:40)
    at Function.from (/usr/share/kibana/node_modules/@kbn/core-http-router-server-internal/src/request.js:65:12)
    at interceptPreResponse (/usr/share/kibana/node_modules/@kbn/core-http-server-internal/src/lifecycle/on_pre_response.js:59:81)
    at exports.Manager.execute (/usr/share/kibana/node_modules/@hapi/hapi/lib/toolkit.js:57:29)
    at Request._invoke (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:397:55)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at Request._postCycle (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:468:32)
    at Request._reply (/usr/share/kibana/node_modules/@hapi/hapi/lib/request.js:447:9)

Any additional context:
Kibana is running inside a Docker container and external 443 port is bound to internal 5601

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[gsoldevila]

The request.url getter (RC of the issue, as it creates an URL object behind the scenes) was introduced in hapi 21.4.3.
We migrated to hapi 21.4.3 on 9.1.3.

I opened an issue in the hapijs repo:
hapijs/hapi#4560

[gsoldevila]

I created a Pull request on the hapijs/hapi repo, but I haven't had any feedback / answers so far.

If this becomes urgent and we don't have a word from hapi folks, we could consider....

• A) Try to get support from hapijs folks, and get the upstream PR merged.
  • UPDATE: I dropped a message on their Slack channel.
• B) We could consider forking the hapijs/hapi repository and integrating the proposed fix (see PR above).
• C) We could try modifying the node_modules/@hapi/hapi/lib/request.js file on-the-fly during the build.
• D) Apply this workaround on our side.

[gsoldevila]

After discussion with the team, we decided to apply the workaround for now.

Hapi seems to no longer be actively maintained (only eventual bug fixes and dependency updates),
and apparently it does not officially support HTTP/2, so I've created an issue to assess possible alternatives.