diff --git a/cs/sdk/src/Proton.Drive.Sdk/Nodes/Cryptography/NodeCrypto.cs b/cs/sdk/src/Proton.Drive.Sdk/Nodes/Cryptography/NodeCrypto.cs
index d2c3c559..e3ac6f6f 100644
--- a/cs/sdk/src/Proton.Drive.Sdk/Nodes/Cryptography/NodeCrypto.cs
+++ b/cs/sdk/src/Proton.Drive.Sdk/Nodes/Cryptography/NodeCrypto.cs
@@ -265,30 +265,36 @@ internal static class NodeCrypto
             return new ProtonDriveError("Cannot get node key", error);
         }
 
+        ArraySegment<byte> serializedExtendedAttributes;
+        AuthorshipVerificationFailure? authorshipVerificationFailure;
         try
         {
-            var serializedExtendedAttributes = DecryptMessage(
+            serializedExtendedAttributes = DecryptMessage(
                 encryptedExtendedAttributes.Value,
                 detachedSignature: null,
                 nodeKey,
                 authorshipClaim.GetKeyRing(nodeKey),
                 out _,
-                out var author);
-
-            try
-            {
-                var extendedAttributes = JsonSerializer.Deserialize(serializedExtendedAttributes, DriveApiSerializerContext.Default.ExtendedAttributes);
-
-                return new DecryptionOutput<ExtendedAttributes?>(extendedAttributes, author);
-            }
-            catch (Exception e)
-            {
-                return new ProtonDriveError("Failed to deserialize extended attributes", e.ToProtonDriveError());
-            }
+                out authorshipVerificationFailure);
         }
         catch (Exception e)
         {
-            return new ProtonDriveError("Failed to decrypt extended attributes", e.ToProtonDriveError());
+            return new DecryptionError("Failed to decrypt extended attributes", e.ToProtonDriveError());
+        }
+
+        try
+        {
+            var extendedAttributes = JsonSerializer.Deserialize(serializedExtendedAttributes, DriveApiSerializerContext.Default.ExtendedAttributes);
+
+            return new DecryptionOutput<ExtendedAttributes?>(extendedAttributes, authorshipVerificationFailure);
+        }
+        catch (JsonException e)
+        {
+            return new ExtendedAttributesDeserializationError(e.ToProtonDriveError());
+        }
+        catch (Exception e)
+        {
+            return new ProtonDriveError("Unknown error while deserializing extended attributes", e.ToProtonDriveError());
         }
     }
 
diff --git a/cs/sdk/src/Proton.Drive.Sdk/Nodes/DtoToMetadataConverter.cs b/cs/sdk/src/Proton.Drive.Sdk/Nodes/DtoToMetadataConverter.cs
index 19f2e216..4bef9ed2 100644
--- a/cs/sdk/src/Proton.Drive.Sdk/Nodes/DtoToMetadataConverter.cs
+++ b/cs/sdk/src/Proton.Drive.Sdk/Nodes/DtoToMetadataConverter.cs
@@ -299,17 +299,25 @@ internal static class DtoToMetadataConverter
         ShareMembershipSummaryDto? membershipDto)
     {
         Dictionary<EncryptedField, ProtonDriveError> failedDecryptionFields = [];
-        List<ProtonDriveError> errors = [];
+        List<ProtonDriveError> nodeKeyErrors = [];
 
         if (decryptionResult.Link.Passphrase.TryGetError(out var passphraseError))
         {
-            errors.Add(new DecryptionError("Passphrase decryption failed", passphraseError));
-            failedDecryptionFields.Add(EncryptedField.NodeKey, passphraseError);
+            nodeKeyErrors.Add(passphraseError);
+
+            if (passphraseError is DecryptionError)
+            {
+                failedDecryptionFields.Add(EncryptedField.NodeKey, passphraseError);
+            }
         }
         else if (decryptionResult.Link.NodeKey.TryGetError(out var nodeKeyError))
         {
-            errors.Add(new DecryptionError("Node key decryption failed", nodeKeyError));
-            failedDecryptionFields.Add(EncryptedField.NodeKey, nodeKeyError);
+            nodeKeyErrors.Add(nodeKeyError);
+
+            if (passphraseError is DecryptionError)
+            {
+                failedDecryptionFields.Add(EncryptedField.NodeKey, nodeKeyError);
+            }
         }
         else if (decryptionResult.ContentKey.TryGetError(out var contentKeyError))
         {
@@ -324,8 +332,12 @@ internal static class DtoToMetadataConverter
         var revisionErrors = new List<ProtonDriveError>();
         if (decryptionResult.ExtendedAttributes.TryGetError(out var extendedAttributesError))
         {
-            revisionErrors.Add(new DecryptionError("Extended attributes decryption failed", extendedAttributesError));
-            failedDecryptionFields.Add(EncryptedField.NodeExtendedAttributes, extendedAttributesError);
+            revisionErrors.Add(extendedAttributesError);
+
+            if (extendedAttributesError is DecryptionError)
+            {
+                failedDecryptionFields.Add(EncryptedField.NodeExtendedAttributes, extendedAttributesError);
+            }
         }
 
         var nodeAuthor = decryptionResult.Link.Passphrase.Merge(
@@ -369,7 +381,7 @@ internal static class DtoToMetadataConverter
                 MediaType = fileDto.MediaType,
                 ActiveRevision = degradedRevision,
                 TotalStorageQuotaUsage = fileDto.TotalSizeOnStorage,
-                Errors = errors,
+                Errors = nodeKeyErrors,
                 CaptureTime = linkDetailsDto.Photo.CaptureTime,
                 AlbumUids = linkDetailsDto.Photo.AlbumInclusions.Select(a => new NodeUid(uid.VolumeId, a.Id)).ToList(),
                 OwnedBy = ownedBy,
@@ -386,7 +398,7 @@ internal static class DtoToMetadataConverter
                 MediaType = fileDto.MediaType,
                 ActiveRevision = degradedRevision,
                 TotalStorageQuotaUsage = fileDto.TotalSizeOnStorage,
-                Errors = errors,
+                Errors = nodeKeyErrors,
                 OwnedBy = ownedBy,
             };
 
@@ -495,25 +507,34 @@ internal static class DtoToMetadataConverter
         ShareMembershipSummaryDto? membershipDto)
     {
         Dictionary<EncryptedField, ProtonDriveError> failedDecryptionFields = [];
-        List<ProtonDriveError> errors = [];
+        List<ProtonDriveError> nodeKeyAndHashKeyErrors = [];
 
         if (decryptionResult.Link.Passphrase.TryGetError(out var passphraseError))
         {
-            errors.Add(new DecryptionError("Passphrase decryption failed", passphraseError));
-            failedDecryptionFields.Add(EncryptedField.NodeKey, passphraseError);
+            nodeKeyAndHashKeyErrors.Add(passphraseError);
+
+            if (passphraseError is DecryptionError)
+            {
+                failedDecryptionFields.Add(EncryptedField.NodeKey, passphraseError);
+            }
         }
         else if (decryptionResult.Link.NodeKey.TryGetError(out var nodeKeyError))
         {
-            errors.Add(new DecryptionError("Node key decryption failed", nodeKeyError));
-            failedDecryptionFields.Add(EncryptedField.NodeKey, nodeKeyError);
+            nodeKeyAndHashKeyErrors.Add(nodeKeyError);
+
+            if (nodeKeyError is DecryptionError)
+            {
+                failedDecryptionFields.Add(EncryptedField.NodeKey, nodeKeyError);
+            }
         }
         else if (decryptionResult.HashKey.TryGetError(out var hashKeyError))
         {
-            errors.Add(new DecryptionError("Hash key decryption failed", hashKeyError));
+            nodeKeyAndHashKeyErrors.Add(hashKeyError);
+
             failedDecryptionFields.Add(EncryptedField.NodeHashKey, hashKeyError);
         }
 
-        if (nameResult.TryGetError(out var nameError))
+        if (nameResult.TryGetError(out var nameError) && nameError is DecryptionError)
         {
             failedDecryptionFields.Add(EncryptedField.NodeName, nameError);
         }
@@ -541,7 +562,7 @@ internal static class DtoToMetadataConverter
             CreationTime = linkDto.CreationTime,
             TrashTime = linkDto.TrashTime,
             Author = nodeAuthor,
-            Errors = errors,
+            Errors = nodeKeyAndHashKeyErrors,
             OwnedBy = MapOwnedBy(linkDto.OwnedBy),
         };
 
diff --git a/cs/sdk/src/Proton.Drive.Sdk/Nodes/ExtendedAttributesDeserializationError.cs b/cs/sdk/src/Proton.Drive.Sdk/Nodes/ExtendedAttributesDeserializationError.cs
new file mode 100644
index 00000000..33b9c8fb
--- /dev/null
+++ b/cs/sdk/src/Proton.Drive.Sdk/Nodes/ExtendedAttributesDeserializationError.cs
@@ -0,0 +1,9 @@
+using System.Text.Json.Serialization;
+
+namespace Proton.Drive.Sdk.Nodes;
+
+[method: JsonConstructor]
+public sealed class ExtendedAttributesDeserializationError(ProtonDriveError? innerError = null)
+    : ProtonDriveError("Failed to deserialize extended attributes", innerError)
+{
+}