diff --git a/go.mod b/go.mod
index 7f8aba175b44..15b4c8c43f28 100644
--- a/go.mod
+++ b/go.mod
@@ -60,7 +60,7 @@ require (
 	go.opentelemetry.io/otel/sdk v1.45.0
 	go.opentelemetry.io/otel/trace v1.45.0
 	go.yaml.in/yaml/v3 v3.0.5
-	golang.org/x/crypto v0.55.0
+	golang.org/x/crypto v0.56.0
 	golang.org/x/mod v0.40.0
 	golang.org/x/sync v0.22.0
 	golang.org/x/sys v0.47.0
diff --git a/go.sum b/go.sum
index 6c3a5b710ff3..674ef2cf1710 100644
--- a/go.sum
+++ b/go.sum
@@ -634,8 +634,8 @@ go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
 go.yaml.in/yaml/v4 v4.0.0-rc.4 h1:UP4+v6fFrBIb1l934bDl//mmnoIZEDK0idg1+AIvX5U=
 go.yaml.in/yaml/v4 v4.0.0-rc.4/go.mod h1:aZqd9kCMsGL7AuUv/m/PvWLdg5sjJsZ4oHDEnfPPfY0=
-golang.org/x/crypto v0.55.0 h1:+KWHjbgOaAQ66dh/YlkZKHlz9ZUlq61AFirAR9ntP8M=
-golang.org/x/crypto v0.55.0/go.mod h1:uq0V9dE/fzQuJtbnL+2EhWOE63vo164FY8xqEnV9xis=
+golang.org/x/crypto v0.56.0 h1:GUh5Ii4J5jtcseSMiRqr1jXCNHoxjeV9Fmekc2oLy6Y=
+golang.org/x/crypto v0.56.0/go.mod h1:OMW5y6CY9l38uPLmxU6l6pwcXp1obtLo3e6gT7gQR2I=
 golang.org/x/mod v0.40.0 h1:hUv+3cXcdRHz08UmSiOob7sadHig73uo5bkXxQ/tvUs=
 golang.org/x/mod v0.40.0/go.mod h1:0/weTWkPWGBikyTWAX3dkjVztMmBA5hM0DH6BElSupE=
 golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go
index fa848f51a5f9..a3b802e4b8bf 100644
--- a/vendor/golang.org/x/crypto/ssh/certs.go
+++ b/vendor/golang.org/x/crypto/ssh/certs.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"slices"
 	"sort"
 	"time"
 )
@@ -305,8 +306,11 @@ const sourceAddressCriticalOption = "source-address"
 // minimally, the IsAuthority callback should be set.
 type CertChecker struct {
 	// SupportedCriticalOptions lists the CriticalOptions that the
-	// server application layer understands. These are only used
-	// for user certificates.
+	// application layer understands. A certificate carrying a critical
+	// option that is not listed here is rejected.
+	// CertChecker.Authenticate additionally accepts the source-address
+	// option, which the server enforces on the Permissions that
+	// Authenticate returns.
 	SupportedCriticalOptions []string
 
 	// IsUserAuthority should return true if the key is recognized as an
@@ -369,8 +373,9 @@ func (c *CertChecker) CheckHostKey(addr string, remote net.Addr, key PublicKey)
 	return c.CheckCert(hostname, cert)
 }
 
-// Authenticate checks a user certificate. Authenticate can be used as
-// a value for ServerConfig.PublicKeyCallback.
+// Authenticate checks a user certificate. Authenticate can be used as a value
+// for ServerConfig.PublicKeyCallback. The source-address critical option is
+// allowed, as it will be enforced by the server.
 func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permissions, error) {
 	cert, ok := pubKey.(*Certificate)
 	if !ok {
@@ -389,8 +394,11 @@ func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permis
 	if !c.IsUserAuthority(cert.SignatureKey) {
 		return nil, fmt.Errorf("ssh: certificate signed by unrecognized authority")
 	}
-
-	if err := c.CheckCert(conn.User(), cert); err != nil {
+	// The source-address critical option is enforced by serverAuthenticate,
+	// so it is supported regardless of SupportedCriticalOptions
+	cc := *c
+	cc.SupportedCriticalOptions = append(slices.Clip(cc.SupportedCriticalOptions), sourceAddressCriticalOption)
+	if err := cc.CheckCert(conn.User(), cert); err != nil {
 		return nil, err
 	}
 
@@ -398,27 +406,15 @@ func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permis
 }
 
 // CheckCert checks CriticalOptions, ValidPrincipals, revocation, timestamp and
-// the signature of the certificate.
+// the signature of the certificate. Critical options that are not listed in
+// SupportedCriticalOptions are rejected.
 func (c *CertChecker) CheckCert(principal string, cert *Certificate) error {
 	if c.IsRevoked != nil && c.IsRevoked(cert) {
 		return fmt.Errorf("ssh: certificate serial %d revoked", cert.Serial)
 	}
 
 	for opt := range cert.CriticalOptions {
-		// sourceAddressCriticalOption will be enforced by
-		// serverAuthenticate
-		if opt == sourceAddressCriticalOption {
-			continue
-		}
-
-		found := false
-		for _, supp := range c.SupportedCriticalOptions {
-			if supp == opt {
-				found = true
-				break
-			}
-		}
-		if !found {
+		if !slices.Contains(c.SupportedCriticalOptions, opt) {
 			return fmt.Errorf("ssh: unsupported critical option %q in certificate", opt)
 		}
 	}
diff --git a/vendor/golang.org/x/crypto/ssh/channel.go b/vendor/golang.org/x/crypto/ssh/channel.go
index ba3279e91d68..d6010fd77b99 100644
--- a/vendor/golang.org/x/crypto/ssh/channel.go
+++ b/vendor/golang.org/x/crypto/ssh/channel.go
@@ -173,6 +173,12 @@ type channel struct {
 	// (for outbound channels) or received (for inbound channels).
 	decided bool
 
+	// established is set to true once the channel is open and may carry normal
+	// channel traffic: for an outbound channel when the peer's open
+	// confirmation is received, for an inbound channel when the local side
+	// accepts it. It is set and read from different goroutines.
+	established atomic.Bool
+
 	// direction contains either channelOutbound, for channels created
 	// locally, or channelInbound, for channels created by the peer.
 	direction channelDirection
@@ -434,10 +440,20 @@ func (ch *channel) responseMessageReceived() error {
 		return errors.New("ssh: duplicate response received for channel")
 	}
 	ch.decided = true
+	ch.established.Store(true)
 	return nil
 }
 
 func (ch *channel) handlePacket(packet []byte) error {
+	// Only the open response is expected before the channel is established.
+	if !ch.established.Load() {
+		switch packet[0] {
+		case msgChannelOpenConfirm, msgChannelOpenFailure:
+		default:
+			return nil
+		}
+	}
+
 	switch packet[0] {
 	case msgChannelData, msgChannelExtendedData:
 		return ch.handleData(packet)
@@ -503,7 +519,8 @@ func (ch *channel) handlePacket(packet []byte) error {
 		default:
 		}
 	default:
-		ch.msg <- msg
+		// No other message type is expected on an established channel.
+		return fmt.Errorf("ssh: unexpected message type %d on channel %d", packet[0], ch.localId)
 	}
 	return nil
 }
@@ -554,6 +571,7 @@ func (ch *channel) Accept() (Channel, <-chan *Request, error) {
 		MaxPacketSize: ch.maxIncomingPayload,
 	}
 	ch.decided = true
+	ch.established.Store(true)
 	if err := ch.sendMessage(confirm); err != nil {
 		return nil, nil, err
 	}
diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go
index fa3dd6a4299b..540865dfc823 100644
--- a/vendor/golang.org/x/crypto/ssh/transport.go
+++ b/vendor/golang.org/x/crypto/ssh/transport.go
@@ -331,13 +331,19 @@ func exchangeVersions(rw io.ReadWriter, versionLine []byte) (them []byte, err er
 // chars
 const maxVersionStringBytes = 255
 
+// maxPreVersionLines is the maximum number of lines sent by the peer
+// before the version string. Each of these lines is limited to a maximum
+// of maxVersionStringBytes chars. Lines sent before the version string
+// are silently ignored.
+const maxPreVersionLines = 1024
+
 // Read version string as specified by RFC 4253, section 4.2.
 func readVersion(r io.Reader) ([]byte, error) {
 	versionString := make([]byte, 0, 64)
 	var ok bool
 	var buf [1]byte
 
-	for length := 0; length < maxVersionStringBytes; length++ {
+	for lines := 0; len(versionString) < maxVersionStringBytes && lines < maxPreVersionLines; {
 		_, err := io.ReadFull(r, buf[:])
 		if err != nil {
 			return nil, err
@@ -347,9 +353,9 @@ func readVersion(r io.Reader) ([]byte, error) {
 		if buf[0] == '\n' {
 			if !bytes.HasPrefix(versionString, []byte("SSH-")) {
 				// RFC 4253 says we need to ignore all version string lines
-				// except the one containing the SSH version (provided that
-				// all the lines do not exceed 255 bytes in total).
+				// except the one containing the SSH version.
 				versionString = versionString[:0]
+				lines++
 				continue
 			}
 			ok = true
diff --git a/vendor/modules.txt b/vendor/modules.txt
index b17bfbeef39b..36eaff2f29d9 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -1273,8 +1273,8 @@ go.yaml.in/yaml/v3
 ## explicit; go 1.18
 go.yaml.in/yaml/v4
 go.yaml.in/yaml/v4/internal/libyaml
-# golang.org/x/crypto v0.55.0
-## explicit; go 1.25.0
+# golang.org/x/crypto v0.56.0
+## explicit; go 1.26.0
 golang.org/x/crypto/argon2
 golang.org/x/crypto/bcrypt
 golang.org/x/crypto/blake2b