diff --git a/libwvdrmengine/cdm/core/include/oemcrypto_adapter.h b/libwvdrmengine/cdm/core/include/oemcrypto_adapter.h
index aeff6e25..d92d2986 100644
--- a/libwvdrmengine/cdm/core/include/oemcrypto_adapter.h
+++ b/libwvdrmengine/cdm/core/include/oemcrypto_adapter.h
@@ -28,6 +28,10 @@ OEMCryptoResult OEMCrypto_GetHDCPCapability(SecurityLevel level,
                                             OEMCrypto_HDCP_Capability* maximum);
 bool OEMCrypto_SupportsUsageTable(SecurityLevel level);
 bool OEMCrypto_IsAntiRollbackHwPresent(SecurityLevel level);
+OEMCryptoResult OEMCrypto_GetNumberOfOpenSessions(SecurityLevel level,
+                                                  size_t* count);
+OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(SecurityLevel level,
+                                                 size_t* maximum);
 }  // namespace wvcdm
 
 #endif  // WVCDM_CORE_OEMCRYPTO_ADAPTER_H_
diff --git a/libwvdrmengine/cdm/core/src/crypto_session.cpp b/libwvdrmengine/cdm/core/src/crypto_session.cpp
index b6f3e171..9c1ba11f 100644
--- a/libwvdrmengine/cdm/core/src/crypto_session.cpp
+++ b/libwvdrmengine/cdm/core/src/crypto_session.cpp
@@ -993,7 +993,8 @@ bool CryptoSession::GetNumberOfOpenSessions(size_t* count) {
   }
 
   size_t sessions_count;
-  OEMCryptoResult status = OEMCrypto_GetNumberOfOpenSessions(&sessions_count);
+  OEMCryptoResult status = OEMCrypto_GetNumberOfOpenSessions(
+      requested_security_level_, &sessions_count);
   if (OEMCrypto_SUCCESS != status) {
     LOGW("OEMCrypto_GetNumberOfOpenSessions fails with %d", status);
     return false;
@@ -1011,7 +1012,8 @@ bool CryptoSession::GetMaxNumberOfSessions(size_t* max) {
   }
 
   size_t max_sessions;
-  OEMCryptoResult status = OEMCrypto_GetMaxNumberOfSessions(&max_sessions);
+  OEMCryptoResult status = OEMCrypto_GetMaxNumberOfSessions(
+      requested_security_level_, &max_sessions);
   if (OEMCrypto_SUCCESS != status) {
     LOGW("OEMCrypto_GetMaxNumberOfSessions fails with %d", status);
     return false;
diff --git a/libwvdrmengine/cdm/core/src/oemcrypto_adapter_dynamic.cpp b/libwvdrmengine/cdm/core/src/oemcrypto_adapter_dynamic.cpp
index 58dc7ea2..5cb83b06 100644
--- a/libwvdrmengine/cdm/core/src/oemcrypto_adapter_dynamic.cpp
+++ b/libwvdrmengine/cdm/core/src/oemcrypto_adapter_dynamic.cpp
@@ -568,6 +568,24 @@ bool OEMCrypto_IsAntiRollbackHwPresent(SecurityLevel level) {
   return fcn->IsAntiRollbackHwPresent();
 }
 
+OEMCryptoResult OEMCrypto_GetNumberOfOpenSessions(SecurityLevel level,
+                                                  size_t* count) {
+  if (!kAdapter) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
+  const FunctionPointers* fcn = kAdapter->get(level);
+  if (!fcn) return OEMCrypto_ERROR_INVALID_SESSION;
+  if (fcn->version < 10) return OEMCrypto_ERROR_NOT_IMPLEMENTED;
+  return fcn->GetNumberOfOpenSessions(count);
+}
+
+OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(SecurityLevel level,
+                                                 size_t* maximum) {
+  if (!kAdapter) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
+  const FunctionPointers* fcn = kAdapter->get(level);
+  if (!fcn) return OEMCrypto_ERROR_INVALID_SESSION;
+  if (fcn->version < 10) return OEMCrypto_ERROR_NOT_IMPLEMENTED;
+  return fcn->GetMaxNumberOfSessions(maximum);
+}
+
 }  // namespace wvcdm
 
 extern "C" OEMCryptoResult OEMCrypto_Initialize(void) {
@@ -795,24 +813,12 @@ extern "C" bool OEMCrypto_IsAntiRollbackHwPresent() {
   return OEMCrypto_IsAntiRollbackHwPresent(kLevelDefault);
 }
 
-extern "C" OEMCryptoResult OEMCrypto_GetNumberOfOpenSessions(size_t* maximum) {
-  if (!kAdapter) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
-  const FunctionPointers* fcn = kAdapter->get(kLevelDefault);
-  if (!fcn) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
-  if (fcn->version < 10) {
-    return OEMCrypto_ERROR_NOT_IMPLEMENTED;
-  }
-  return fcn->GetNumberOfOpenSessions(maximum);
+extern "C" OEMCryptoResult OEMCrypto_GetNumberOfOpenSessions(size_t* count) {
+  return OEMCrypto_GetNumberOfOpenSessions(kLevelDefault, count);
 }
 
-extern "C" OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(size_t *maximum) {
-  if (!kAdapter) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
-  const FunctionPointers* fcn = kAdapter->get(kLevelDefault);
-  if (!fcn) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
-  if (fcn->version < 10) {
-    return OEMCrypto_ERROR_NOT_IMPLEMENTED;
-  }
-  return fcn->GetMaxNumberOfSessions(maximum);
+extern "C" OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(size_t* maximum) {
+  return OEMCrypto_GetMaxNumberOfSessions(kLevelDefault, maximum);
 }
 
 extern "C" OEMCryptoResult OEMCrypto_Generic_Encrypt(
diff --git a/libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.h b/libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.h
index c2be6496..e8248cba 100644
--- a/libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.h
+++ b/libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.h
@@ -239,6 +239,12 @@ class CryptoEngine {
 
   size_t GetNumberOfOpenSessions() { return sessions_.size(); }
 
+  size_t GetMaxNumberOfSessions() {
+    // An arbitrary limit for mock implementation.
+    static const size_t kMaxSupportedOEMCryptoSessions = 64;
+    return kMaxSupportedOEMCryptoSessions;
+  }
+
   void set_current_session_(SessionContext* current) {
     current_session_ = current;
   }
diff --git a/libwvdrmengine/oemcrypto/mock/src/oemcrypto_mock.cpp b/libwvdrmengine/oemcrypto/mock/src/oemcrypto_mock.cpp
index 0b01dddf..96826303 100644
--- a/libwvdrmengine/oemcrypto/mock/src/oemcrypto_mock.cpp
+++ b/libwvdrmengine/oemcrypto/mock/src/oemcrypto_mock.cpp
@@ -80,6 +80,11 @@ OEMCryptoResult OEMCrypto_OpenSession(OEMCrypto_SESSION* session) {
     LOGI("-- OEMCryptoResult OEMCrypto_OpenSession"
          "(OEMCrypto_SESSION *session)\n");
   }
+  if (crypto_engine->GetNumberOfOpenSessions() >=
+      crypto_engine->GetMaxNumberOfSessions()) {
+    LOGE("[OEMCrypto_OpenSession(): failed due to too many sessions]");
+    return OEMCrypto_ERROR_TOO_MANY_SESSIONS;
+  }
   SessionId sid = crypto_engine->CreateSession();
   *session = (OEMCrypto_SESSION)sid;
   if (LogCategoryEnabled(kLoggingTraceOEMCryptoCalls)) {
@@ -1040,8 +1045,7 @@ OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(size_t* maximum) {
     LOGI("-- OEMCryptoResult OEMCrypto_GetMaxNumberOfSessions(%p)\n", maximum);
   }
   if (maximum == NULL) return OEMCrypto_ERROR_UNKNOWN_FAILURE;
-  const size_t kMaxSupportedOEMCryptoSessions = 64;
-  *maximum = kMaxSupportedOEMCryptoSessions;
+  *maximum = crypto_engine->GetMaxNumberOfSessions();
   return OEMCrypto_SUCCESS;
 }
 
diff --git a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
index 3a6e7128..eecd6036 100644
--- a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
+++ b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
@@ -1746,12 +1746,26 @@ TEST_F(OEMCryptoClientTest, MaxSessionsOpenClose) {
   ASSERT_EQ(0, sessions_count);
   size_t max_sessions;
   ASSERT_EQ(OEMCrypto_SUCCESS, OEMCrypto_GetMaxNumberOfSessions(&max_sessions));
-  ASSERT_GT(max_sessions, 0);
+  // We expect OEMCrypto implementations support at least 8 sessions.
+  const size_t kMinimumSupportedMaxNumberOfSessions = 8u;
+  ASSERT_GE(max_sessions, kMinimumSupportedMaxNumberOfSessions);
 
   vector<OEMCrypto_SESSION> sessions;
-  for (int i = 0; i < max_sessions; i++) {
+  // Limit the number of sessions for testing.
+  const size_t kMaxNumberOfSessionsForTesting = 0x100u;
+  for (int i = 0; i < kMaxNumberOfSessionsForTesting; i++) {
     OEMCrypto_SESSION session_id;
-    ASSERT_EQ(OEMCrypto_SUCCESS, OEMCrypto_OpenSession(&session_id));
+    OEMCryptoResult sts = OEMCrypto_OpenSession(&session_id);
+    // GetMaxNumberOfSessions might be an estimate. We allow OEMCrypto to report
+    // a max that is less than what is actually supported. Assume the number
+    // returned is |max|. OpenSessions shall not fail if number of active
+    // sessions is less than |max|; OpenSessions should fail with
+    // OEMCrypto_ERROR_TOO_MANY_SESSIONS if too many sessions are open.
+    if (sts != OEMCrypto_SUCCESS) {
+      ASSERT_EQ(OEMCrypto_ERROR_TOO_MANY_SESSIONS, sts);
+      ASSERT_GE(i, max_sessions);
+      break;
+    }
     ASSERT_EQ(OEMCrypto_SUCCESS,
               OEMCrypto_GetNumberOfOpenSessions(&sessions_count));
     ASSERT_EQ(i + 1, sessions_count);
@@ -1763,6 +1777,13 @@ TEST_F(OEMCryptoClientTest, MaxSessionsOpenClose) {
               OEMCrypto_GetNumberOfOpenSessions(&sessions_count));
     ASSERT_EQ(sessions.size() - i - 1, sessions_count);
   }
+  if (sessions.size() == kMaxNumberOfSessionsForTesting) {
+    printf(
+        "             MaxSessionsOpenClose: reaches "
+        "kMaxNumberOfSessionsForTesting(%zu). GetMaxNumberOfSessions = %zu. "
+        "ERROR_TOO_MANY_SESSIONS not tested.",
+        kMaxNumberOfSessionsForTesting, max_sessions);
+  }
 }
 
 TEST_F(OEMCryptoClientTest, GenerateNonce) {