CVE-2020-9283

Exploit for CVE-2020-9283 This project is inspired by the original POC found here github.com/mark-adams/exploits/CVE-2020-9283. I was curious as to how the Go SSH library was implemented so decided to implement the PoC using go. A short writeup can be found here...

Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

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Important: Red Hat Security Advisory: OpenShift Container Platform 4.17.57 security and extras update

Red Hat OpenShift Container Platform release 4.17.57 is now available with updates to packages and images that fix several bugs. This release includes a security update for Red Hat OpenShift Container Platform 4.17. Red Hat Product Security has rated this update as having a security impact of...

CVE-2026-78662 Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time,...

CVE-2026-78662 Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time,...

CVE-2026-78662

CVE-2026-78662 affects the golang.org/x/crypto/ssh library. A channel registered in the mux's chanList was not marked as established until fully set up. A malicious peer could flood the channel's incomingRequests, deadlocking the entire connection (DoS). The fix introduces an atomic established s...

CVE-2026-56855

CVE-2026-56855 is a denial-of-service vulnerability in the golang.org/x/crypto/ssh package. After an SSH channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection . The root cause was that the implementation was buffering and blocking on ...

CVE-2026-56855 Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connectio...

GO-2026-6354 Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh

Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time,...

GO-2026-6355 Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connectio...

Allocation of Resources Without Limits or Throttling

Overview golang.org/x/crypto/ssh is a SSH client and server Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the connection multiplexer's channel handling the mux chanList, reached through Dial, NewClientConn, NewControlClientConn, and...

Allocation of Resources Without Limits or Throttling

Overview golang.org/x/crypto/ssh is a SSH client and server Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in its connection multiplexing, reached through Dial, NewClientConn, NewControlClientConn, and NewServerConn, which buffers unhandle...

Allocation of Resources Without Limits or Throttling

Overview github.com/golang/crypto/ssh is a SSH client and server Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in its connection multiplexing, reached through Dial, NewClientConn, NewControlClientConn, and NewServerConn, which buffers...

Allocation of Resources Without Limits or Throttling

Overview github.com/golang/crypto/ssh is a SSH client and server Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the connection multiplexer's channel handling the mux chanList, reached through Dial, NewClientConn, NewControlClientConn, a...

CVE-2026-56854

A flaw was found in golang.org/x/crypto/ssh. The component failed to properly enforce source-address restrictions for several authentication methods, including password and keyboard-interactive callbacks. This oversight could allow a remote attacker to bypass intended network-based access control...

CVE-2026-56854 Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback,...

CVE-2026-56854 Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback,...

CVE-2026-56854

CVE-2026-56854 affects golang.org/x/crypto/ssh . The source-address critical option in Permissions returned by authentication callbacks was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths (extending a prior fix for CVE-2026-46595). Callbacks for PasswordCallback , Keyb...

Incorrect Authorization

Overview golang.org/x/crypto/ssh is a SSH client and server Affected versions of this package are vulnerable to Incorrect Authorization in NewServerConn, which applied the critical option from the Permissions returned by an authentication callback only on the PublicKeyCallback and...

GO-2026-6303 Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback,...