etcd before versions 3.3.23 and 3.4.10 does not perform any password length validation, which allows for very short passwords, such as those with a length of one. This may allow an attacker to guess or brute-force users' passwords with little computational effort.
Affected: Go: go.etcd.io/etcd/client/v3
### Vulnerability type Access Control
### Workarounds The etcdctl and etcd API do not enforce a specific password length during user creation or user password update operations. [It is the responsibility of the administrator to enforce these requirements](https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/authentication.md#notes-on-password-strength).
### Detail etcd does not perform any password length validation, which allows for very short passwords, such as those with a length of one. This may allow an attacker to guess or brute-force users’ passwords with little computational effort.
### References Find out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf)
### For more information If you have any questions or comments about this advisory: * Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)
etcd: Large slice causes panic in decodeRecord method etcd: DoS in wal/wal.go etcd: directories created via os.MkdirAll are not checked for permissions etcd: gateway can include itself as an endpoint resulting in resource exhaustion and leads to DoS etcd: improper validation of passwords allow an attacker to guess or brute-force user's passwords etcd: no authentication is performed against endpoints provided in the --endpoints flag
Affected: Ubuntu:16.04:LTS: etcd, Ubuntu:Pro:18.04:LTS: etcd, Ubuntu:Pro:20.04:LTS: etcd, Ubuntu:Pro:22.04:LTS: etcd, Ubuntu:Pro:24.04:LTS: etcd, Ubuntu:25.10: etcd, Ubuntu:Pro:26.04:LTS: etcd
etcd before versions 3.3.23 and 3.4.10 does not perform any password length validation, which allows for very short passwords, such as those with a length of one. This may allow an attacker to guess or brute-force users' passwords with little computational effort.