Description
In etcd before versions 3.3.23 and 3.4.10, the etcd gateway is a simple TCP proxy to allow for basic service discovery and access. However, it is possible to include the gateway address as an endpoint. This results in a denial of service, since the endpoint can become stuck in a loop of requesting itself until there are no more available file descriptors to accept connections on the gateway.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| etcd-io | etcd | < 3.3.23, < 3.4.10 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | etcd | 3.3.25+dfsg-5 | — |
| Debian 13 | etcd | 3.3.25+dfsg-5 | — |
| Debian 12 | etcd | 3.3.25+dfsg-5 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | etcd | 3.2.26+dfsg-6ubuntu0.1 | USN-5628-1 |
| Ubuntu 16.04 LTS | etcd | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | etcd | 3.2.17+dfsg-1ubuntu0.1~esm1 | USN-5628-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenStack 16 | etcd | 3.3.23-1.el8ost | RHSA-2021:0916 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | etcd | 3.5.0-3 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | dgraph | 23.1.0-r6 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | go.etcd.io/etcd | >= 3.4.0-rc.0, < 3.4.10 | 3.4.10 | GHSA-2xhq-gv6c-p224 |
| Go | go.etcd.io/etcd | < 3.3.23 | 3.3.23 | GHSA-2xhq-gv6c-p224 |
Advisories 3
- RHSA-2021:0916 Red Hat Security Advisory: Red Hat OpenStack Platform 16.1.4 (etcd) security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-5628-2 etcd vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-5628-1 etcd vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026