Description
The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.
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 | python-asyncssh | 1.12.1-1 | — |
| Debian 13 | python-asyncssh | 1.12.1-1 | — |
| Debian 12 | python-asyncssh | 1.12.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | python-asyncssh | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | python-asyncssh | 1.11.1-1ubuntu0.1~esm1 | USN-4854-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | asyncssh | < 1.12.1 | 1.12.1 | GHSA-97cv-6pjf-5f9q |
Advisories 1
- USN-4854-1 python-asyncssh vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026