diff --git a/go.mod b/go.mod
index 28a04386..ea762841 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.25.5
 require (
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
 	github.com/free5gc/openapi v1.2.3
-	github.com/free5gc/util v1.3.1
+	github.com/free5gc/util v1.3.2-0.20260107090449-c09baaf75b11
 	github.com/gin-gonic/gin v1.10.0
 	github.com/google/uuid v1.3.0
 	github.com/h2non/gock v1.2.0
diff --git a/go.sum b/go.sum
index 3a06cb8f..a602c1b0 100644
--- a/go.sum
+++ b/go.sum
@@ -27,8 +27,8 @@ github.com/free5gc/ngap v1.1.2 h1:AA+s9+eaE8fSTnmBbh1xiD3VPaszonCd7AQJGKX5PHM=
 github.com/free5gc/ngap v1.1.2/go.mod h1:4HYtB+msoTBc3cEPlSr4ZUUHn3BFZhdPuVASERMzVeI=
 github.com/free5gc/openapi v1.2.3 h1:w4TmYBR8TUE4ZgKo7eiMZbyZPURSBFlMWiFeX+OsiA8=
 github.com/free5gc/openapi v1.2.3/go.mod h1:fLvaBtUZrvrzkKrmn5Aza+JNbpWnp3kxKixu6kLSD3k=
-github.com/free5gc/util v1.3.1 h1:5j5Exvp42Ow3zNP2aaAp68MSne6BcaCF4/cekXYUS6w=
-github.com/free5gc/util v1.3.1/go.mod h1:qsv/ez8YhI+pO8bjNiZWXc2xmRE3XuEIa0EDTCPkSy0=
+github.com/free5gc/util v1.3.2-0.20260107090449-c09baaf75b11 h1:/UZetXmPa5T/TKKxqU3Osw9x3+nIuACTXJxOU+gYGTU=
+github.com/free5gc/util v1.3.2-0.20260107090449-c09baaf75b11/go.mod h1:qsv/ez8YhI+pO8bjNiZWXc2xmRE3XuEIa0EDTCPkSy0=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
 github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
diff --git a/internal/sbi/api_ueauthentication.go b/internal/sbi/api_ueauthentication.go
index f58795a4..17f0e152 100644
--- a/internal/sbi/api_ueauthentication.go
+++ b/internal/sbi/api_ueauthentication.go
@@ -9,6 +9,7 @@ import (
 	"github.com/free5gc/openapi/models"
 	"github.com/free5gc/udm/internal/logger"
 	"github.com/free5gc/util/metrics/sbi"
+	"github.com/free5gc/util/validator"
 )
 
 func (s *Server) getUEAuthenticationRoutes() []Route {
@@ -25,6 +26,22 @@ func (s *Server) getUEAuthenticationRoutes() []Route {
 // ConfirmAuth - Create a new confirmation event
 func (s *Server) HandleConfirmAuth(c *gin.Context) {
 	var authEvent models.AuthEvent
+	// TS 29.503 6.3.6.2.3
+	// Validate SUPI format
+	supi := c.Params.ByName("supi")
+	if !validator.IsValidSupi(supi) {
+		problemDetail := models.ProblemDetails{
+			Title:  "Malformed request syntax",
+			Status: http.StatusBadRequest,
+			Detail: "Supi is invalid",
+			Cause:  "MANDATORY_IE_INCORRECT",
+		}
+		logger.UeauLog.Warnln("Supi is invalid")
+		c.Set(sbi.IN_PB_DETAILS_CTX_STR, http.StatusText(int(problemDetail.Status)))
+		c.JSON(int(problemDetail.Status), problemDetail)
+		return
+	}
+
 	requestBody, err := c.GetRawData()
 	if err != nil {
 		problemDetail := models.ProblemDetails{
@@ -53,7 +70,30 @@ func (s *Server) HandleConfirmAuth(c *gin.Context) {
 		return
 	}
 
-	supi := c.Params.ByName("supi")
+	// TS 29.503 6.3.6.2.7 requirements check
+	missingIE := ""
+	if authEvent.NfInstanceId == "" {
+		missingIE = "nfInstanceId"
+	} else if authEvent.TimeStamp == nil {
+		missingIE = "timestamp"
+	} else if authEvent.AuthType == "" {
+		missingIE = "authtype"
+	} else if authEvent.ServingNetworkName == "" {
+		missingIE = "servingNetworkName"
+	}
+
+	if missingIE != "" {
+		problemDetail := models.ProblemDetails{
+			Title:  "Missing or invalid parameter",
+			Status: http.StatusBadRequest,
+			Detail: "Mandatory IE " + missingIE + " is missing or invalid",
+			Cause:  "MANDATORY_IE_MISSING",
+		}
+		logger.UeauLog.Warnln("Mandatory IE " + missingIE + "is missing or invalid")
+		c.Set(sbi.IN_PB_DETAILS_CTX_STR, http.StatusText(int(problemDetail.Status)))
+		c.JSON(int(problemDetail.Status), problemDetail)
+		return
+	}
 
 	logger.UeauLog.Infoln("Handle ConfirmAuthDataRequest")
 
@@ -63,6 +103,21 @@ func (s *Server) HandleConfirmAuth(c *gin.Context) {
 // GenerateAuthData - Generate authentication data for the UE
 func (s *Server) HandleGenerateAuthData(c *gin.Context) {
 	var authInfoReq models.AuthenticationInfoRequest
+	// TS 29.503 6.3.3.2.2
+	// Validate SUPI or SUCI format
+	supiOrSuci := c.Param("supiOrSuci")
+	if !validator.IsValidSupi(supiOrSuci) && !validator.IsValidSuci(supiOrSuci) {
+		problemDetail := models.ProblemDetails{
+			Title:  "Malformed request syntax",
+			Status: http.StatusBadRequest,
+			Detail: "Supi or Suci is invalid",
+			Cause:  "MANDATORY_IE_INCORRECT",
+		}
+		logger.UeauLog.Warnln("Supi or Suci is invalid")
+		c.Set(sbi.IN_PB_DETAILS_CTX_STR, http.StatusText(int(problemDetail.Status)))
+		c.JSON(int(problemDetail.Status), problemDetail)
+		return
+	}
 
 	requestBody, err := c.GetRawData()
 	if err != nil {
@@ -92,9 +147,28 @@ func (s *Server) HandleGenerateAuthData(c *gin.Context) {
 		return
 	}
 
-	logger.UeauLog.Infoln("Handle GenerateAuthDataRequest")
+	// TS 29.503 6.3.6.2.2 requirements check
+	missingIE := ""
+	if authInfoReq.ServingNetworkName == "" {
+		missingIE = "servingNetworkName"
+	} else if authInfoReq.AusfInstanceId == "" {
+		missingIE = "ausfInstanceId"
+	}
 
-	supiOrSuci := c.Param("supiOrSuci")
+	if missingIE != "" {
+		problemDetail := models.ProblemDetails{
+			Title:  "Missing or invalid parameter",
+			Status: http.StatusBadRequest,
+			Detail: "Mandatory IE " + missingIE + " is missing or invalid",
+			Cause:  "MANDATORY_IE_MISSING",
+		}
+		logger.UeauLog.Warnln("Mandatory IE " + missingIE + "is missing or invalid")
+		c.Set(sbi.IN_PB_DETAILS_CTX_STR, http.StatusText(int(problemDetail.Status)))
+		c.JSON(int(problemDetail.Status), problemDetail)
+		return
+	}
+
+	logger.UeauLog.Infoln("Handle GenerateAuthDataRequest")
 
 	s.Processor().GenerateAuthDataProcedure(c, authInfoReq, supiOrSuci)
 }