CVE-2026-39827 Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for...

CVE-2026-46595

CVE-2026-46595 affects golang.org/x/crypto/ssh. The issue arises when VerifiedPublicKeyCallback is invoked with a callback type other than public key, causing the source-address validation to be bypassed and enabling an authorization bypass. The description notes this is a continuation of CVE-202...

CVE-2026-39830 Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close, resulting in a resource leak per connection. Unsolicited global responses are now discarded...

CVE-2026-42508 Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts

Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked...

CVE-2026-39834 Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation...

CVE-2026-39830 Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close, resulting in a resource leak per connection. Unsolicited global responses are now discarded...

EUVD-2026-31397

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close, resulting in a resource leak per connection. Unsolicited global responses are now discarded...

CVE-2026-39834

CVE-2026-39834 concerns a flaw in golang.org/x/crypto/ssh where writing data larger than 4GB in a single Write on an SSH channel triggers an integer overflow in the internal payload size calculation. The overflow causes the write loop to spin indefinitely, sending empty packets and making no prog...

CVE-2026-39832 Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent

When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all...

CVE-2026-39828 Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError...

CVE-2026-39828

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError...

CVE-2026-46597 Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh

An incorrectly placed cast from bytes to int allowed for server-side panic in the AES-GCM packet decoder for well-crafted inputs...

CVE-2026-46597 Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh

An incorrectly placed cast from bytes to int allowed for server-side panic in the AES-GCM packet decoder for well-crafted inputs...

CVE-2026-46597

CVE-2026-46597 describes an incorrectly placed cast from bytes to int that can cause a server-side panic in the AES-GCM packet decoder when processing crafted inputs. The entry lists high availability impact with network-based exploitability and no privileges required, but the provided documents ...

EUVD-2026-31394

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError...

CVE-2026-39833

The CVE-2026-39833 issue affects the in-memory keyring used by golang.org/x/crypto/ssh/agent. The ConfirmBeforeUse constraint was silently accepted but not enforced by NewKeyring(), allowing keys to sign without a required confirmation prompt and without notifying the caller. The patch fixes this...

CVE-2026-39828 Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError...

CVE-2026-39835

CVE-2026-39835 affects SSH servers using CertChecker as a public key callback when IsUserAuthority or IsHostAuthority callbacks are nil. The root cause is a potential panic on client certificate presentation. The official fix changes CertChecker to return an error instead of panicking under these...

GO-2026-5015 Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil...

GO-2026-5005 Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent

The in-memory keyring returned by NewKeyring silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring now returns an error when...