diff --git a/src/base/bittorrent/sessionimpl.cpp b/src/base/bittorrent/sessionimpl.cpp
index 3bdd9ff13..3b04efc37 100644
--- a/src/base/bittorrent/sessionimpl.cpp
+++ b/src/base/bittorrent/sessionimpl.cpp
@@ -4102,6 +4102,11 @@ void SessionImpl::updateTrackersFromURL()
         {
             if (result.status == Net::DownloadStatus::Success)
             {
+                if (!result.contentType.contains(u"text/plain"_s, Qt::CaseInsensitive))
+                {
+                    LogMsg(tr("Cannot add trackers from URL, expected Content-Type is \'text/plain\' received \"%1\"").arg(result.contentType), Log::WARNING);
+                    return;
+                }
                 setAdditionalTrackersFromURL(QString::fromUtf8(result.data));
                 LogMsg(tr("Tracker list updated"), Log::INFO);
                 return;
diff --git a/src/base/net/downloadhandlerimpl.cpp b/src/base/net/downloadhandlerimpl.cpp
index abc796d37..fe83120a0 100644
--- a/src/base/net/downloadhandlerimpl.cpp
+++ b/src/base/net/downloadhandlerimpl.cpp
@@ -143,6 +143,7 @@ void Net::DownloadHandlerImpl::processFinishedDownload()
 #else
     m_result.data = m_reply->readAll();
 #endif
+    m_result.contentType = m_reply->header(QNetworkRequest::ContentTypeHeader).toString();
 
     if (m_downloadRequest.saveToFile())
     {
diff --git a/src/base/net/downloadmanager.h b/src/base/net/downloadmanager.h
index 8f74c2f9d..b1cf32425 100644
--- a/src/base/net/downloadmanager.h
+++ b/src/base/net/downloadmanager.h
@@ -104,6 +104,7 @@ namespace Net
         QString url;
         DownloadStatus status = DownloadStatus::Failed;
         QString errorString;
+        QString contentType;
         QByteArray data;
         Path filePath;
         QString magnetURI;
diff --git a/src/gui/trackersadditiondialog.cpp b/src/gui/trackersadditiondialog.cpp
index 0014d5a55..2ae916370 100644
--- a/src/gui/trackersadditiondialog.cpp
+++ b/src/gui/trackersadditiondialog.cpp
@@ -74,14 +74,35 @@ TrackersAdditionDialog::~TrackersAdditionDialog()
     delete m_ui;
 }
 
-void TrackersAdditionDialog::onAccepted() const
+bool isValidEndpoint(const QStringView endpoint)
+{
+    if (endpoint.isEmpty())
+        return false;
+    const QUrl url {endpoint.toString()};
+    if (!url.isValid())
+        return false;
+    if (url.scheme().isEmpty())
+        return false;
+    if (url.host().isEmpty())
+        return false;
+    return true;
+}
+
+void TrackersAdditionDialog::onAccepted()
 {
     const QList<BitTorrent::TrackerEntryStatus> currentTrackers = m_torrent->trackers();
     const int baseTier = !currentTrackers.isEmpty() ? (currentTrackers.last().tier + 1) : 0;
 
     QList<BitTorrent::TrackerEntry> entries = BitTorrent::parseTrackerEntries(m_ui->textEditTrackersList->toPlainText());
     for (BitTorrent::TrackerEntry &entry : entries)
+    {
+        if (!isValidEndpoint(entry.url))
+        {
+            QMessageBox::warning(this, tr("Invalid tracker URL"), tr("The tracker URL \"%1\" is invalid").arg(entry.url));
+            return;
+        }
         entry.tier = Utils::Number::clampingAdd(entry.tier, baseTier);
+    }
 
     m_torrent->addTrackers(entries);
 }
@@ -116,6 +137,13 @@ void TrackersAdditionDialog::onTorrentListDownloadFinished(const Net::DownloadRe
         return;
     }
 
+    if (!result.contentType.contains(u"text/plain"_s, Qt::CaseInsensitive))
+    {
+        QMessageBox::warning(this, tr("Download trackers list error")
+            , tr("The content type of the downloaded file is not plain text. Content-Type: \"%1\"").arg(result.contentType));
+        return;
+    }
+
     // Add fetched trackers to the list
     const QString existingText = m_ui->textEditTrackersList->toPlainText();
     if (!existingText.isEmpty() && !existingText.endsWith(u'\n'))
diff --git a/src/gui/trackersadditiondialog.h b/src/gui/trackersadditiondialog.h
index 0dc658cff..ebb214050 100644
--- a/src/gui/trackersadditiondialog.h
+++ b/src/gui/trackersadditiondialog.h
@@ -58,7 +58,7 @@ public:
     ~TrackersAdditionDialog();
 
 private slots:
-    void onAccepted() const;
+    void onAccepted();
     void onDownloadButtonClicked();
     void onTorrentListDownloadFinished(const Net::DownloadResult &result);