CVE-2026-62949 AsyncSSH: asyncio event-loop freeze via SSH maximum packet size = 0 in SSH_MSG_CHANNEL_OPEN / OPEN_CONFIRMATION

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.24.0, processchannelopen and processchannelopenconfirmation in asyncssh/connection.py accept a peer-supplied sendpktsize value of...

CVE-2026-62949: Loop with Unreachable Exit Condition

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.24.0, processchannelopen and processchannelopenconfirmation in asyncssh/connection.py accept a peer-supplied sendpktsize value of...

CVE-2026-90623

A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/sshconnection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely...

CVE-2026-90623 andreashappe cochise SSH Host Key ssh_connection.py asyncssh.connect certificate validation

A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/sshconnection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely...

CVE-2026-90623 andreashappe cochise SSH Host Key ssh_connection.py asyncssh.connect certificate validation

A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/sshconnection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely...

PT-2026-91041

A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/ssh connection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely...

asyncssh has SCP Path Traversal to Arbitrary File Write

| | ||---|---|| Product | asyncssh all versions through 2.23.0 || Related | CVE-2019-6111 same class in OpenSSH || Fix | AsyncSSH 2.23.1 |A malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences. The SCP recei...

PYSEC-2026-3809 asyncssh has an incomplete fix for CVE-2026-45309 — AuthorizedKeysFile %u still escapes the intended directory via a leading ~ (and weakly via ${ENV}) username substitution

Incomplete fix for CVE-2026-45309 GHSA-g794-3fmp-753h. The 2.23.0 guard that sanitises the SSH username before %u substitution in AuthorizedKeysFile blocks /, \ and .., but does not block a leading or $ENV, both of which are re-introduced by later expansion and reach the file open — defeating the...

asyncssh has an incomplete fix for CVE-2026-45309 — AuthorizedKeysFile %u still escapes the intended directory via a leading ~ (and weakly via ${ENV}) username substitution

Incomplete fix for CVE-2026-45309 GHSA-g794-3fmp-753h. The 2.23.0 guard that sanitises the SSH username before %u substitution in AuthorizedKeysFile blocks /, \ and .., but does not block a leading or $ENV, both of which are re-introduced by later expansion and reach the file open — defeating the...

PYSEC-2026-3808 asyncssh has SCP Path Traversal to Arbitrary File Write

| | | |---|---| | Product | asyncssh all versions through 2.23.0 | | Related | CVE-2019-6111 same class in OpenSSH | | Fix | AsyncSSH 2.23.1 | A malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences. The SCP...

asyncssh has SCP Path Traversal to Arbitrary File Write

| | | |---|---| | Product | asyncssh all versions through 2.23.0 | | Related | CVE-2019-6111 same class in OpenSSH | | Fix | AsyncSSH 2.23.1 | A malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences. The SCP...

GHSA-2WXC-X7RJ-HG8F asyncssh has SCP Path Traversal to Arbitrary File Write

| | | |---|---| | Product | asyncssh all versions through 2.23.0 | | Related | CVE-2019-6111 same class in OpenSSH | | Fix | AsyncSSH 2.23.1 | A malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences. The SCP...

asyncssh has an incomplete fix for CVE-2026-45309 — AuthorizedKeysFile %u still escapes the intended directory via a leading ~ (and weakly via ${ENV}) username substitution

Incomplete fix for CVE-2026-45309 GHSA-g794-3fmp-753h. The 2.23.0 guard that sanitises the SSH username before %u substitution in AuthorizedKeysFile blocks /, \ and .., but does not block a leading or $ENV, both of which are re-introduced by later expansion and reach the file open — defeating the...

EUVD-2026-42400

asyncssh has an incomplete fix for CVE-2026-45309 — AuthorizedKeysFile %u still escapes the intended directory via a leading and weakly via $ENV username substitution...

GHSA-QR67-GV47-XWWH asyncssh has an incomplete fix for CVE-2026-45309 — AuthorizedKeysFile %u still escapes the intended directory via a leading ~ (and weakly via ${ENV}) username substitution

Incomplete fix for CVE-2026-45309 GHSA-g794-3fmp-753h. The 2.23.0 guard that sanitises the SSH username before %u substitution in AuthorizedKeysFile blocks /, \ and .., but does not block a leading or $ENV, both of which are re-introduced by later expansion and reach the file open — defeating the...

CVE-2026-45309

A flaw was found in AsyncSSH, a Python package for SSHv2 protocol implementation. A remote attacker can exploit a path traversal vulnerability by manipulating the SSH username during pre-authentication. This allows the attacker to read sensitive authorized-keys files from unintended directories,...

Fedora 43 : python-asyncssh (2026-574496d9ae)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-574496d9ae advisory. import asyncssh 2.23.1 Fix CVE-2026-54590: Unauthorized file modification via authorized-keys directory escape Fix CVE-2026-54591: Arbitrary file...

Fedora 44 : python-asyncssh (2026-1f248487e4)

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-1f248487e4 advisory. update to version 2.24.0 Fix CVE-2026-54590: Unauthorized file modification via authorized-keys directory escape Fix CVE-2026-54591: Arbitrary file...

CVE-2026-45309

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py,...

CVE-2026-45309 AsyncSSH `AuthorizedKeysFile %u` path traversal allows attacker-selected authorized keys to authenticate a traversal username

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py,...