diff --git a/src/coders/vec3.cpp b/src/coders/vec3.cpp
index e00bdd662..119cbed92 100644
--- a/src/coders/vec3.cpp
+++ b/src/coders/vec3.cpp
@@ -133,6 +133,9 @@ static model::Mesh load_mesh(
     if (flags == FLAG_ZLIB) {
         throw std::runtime_error("compression is not supported yet");
     }
+    if (attributeCount <= 0) {
+        throw std::runtime_error("mesh must have at least one attribute");
+    }
     std::vector<VertexAttribute> attributes;
     for (int i = 0; i < attributeCount; i++) {
         attributes.push_back(load_attribute(reader));
diff --git a/src/io/devices/StdfsDevice.cpp b/src/io/devices/StdfsDevice.cpp
index fc0602b52..6f0e37e0e 100644
--- a/src/io/devices/StdfsDevice.cpp
+++ b/src/io/devices/StdfsDevice.cpp
@@ -20,10 +20,29 @@ StdfsDevice::StdfsDevice(fs::path root, bool createDirectory)
                            << ": " << ec.message();
         }
     }
+    absoluteRoot = fs::absolute(this->root).lexically_normal();
+    if (!absoluteRoot.has_filename() && absoluteRoot.has_relative_path()) {
+        absoluteRoot = absoluteRoot.parent_path();
+    }
 }
 
 fs::path StdfsDevice::resolve(std::string_view path) {
-    return root / fs::u8path(io::path(std::string(path)).normalized().string());
+    if (path.find_first_of(std::string_view("\0\\:", 3)) != std::string_view::npos) {
+        throw std::runtime_error("invalid path");
+    }
+    fs::path rel = fs::u8path(io::path(std::string(path)).normalized().string());
+    if (rel.has_root_name() || rel.has_root_directory()) {
+        throw std::runtime_error("absolute paths are not allowed");
+    }
+    fs::path full = (absoluteRoot / rel).lexically_normal();
+    fs::path inside = full.lexically_relative(absoluteRoot);
+    if (inside.empty() || *inside.begin() == "..") {
+        throw std::runtime_error("path escapes device root");
+    }
+    if (inside == ".") {
+        return absoluteRoot;
+    }
+    return full;
 }
 
 std::unique_ptr<std::ostream> StdfsDevice::write(std::string_view path) {
@@ -90,17 +109,32 @@ bool StdfsDevice::mkdirs(std::string_view path) {
 
 bool StdfsDevice::remove(std::string_view path) {
     auto resolved = resolve(path);
-    return fs::remove(resolved);
+    if (resolved == absoluteRoot) {
+        throw std::runtime_error("unable to remove device root");
+    }
+    std::error_code ec;
+    bool removed = fs::remove(resolved, ec);
+    if (ec) {
+        logger.error() << "error removing " << resolved << ": " << ec.message();
+    }
+    return removed;
 }
 
 uint64_t StdfsDevice::removeAll(std::string_view path) {
     auto resolved = resolve(path);
-    if (fs::exists(resolved)) {
-        logger.info() << "removeAll " << resolved; 
-        return fs::remove_all(resolved);
-    } else {
+    if (resolved == absoluteRoot) {
+        throw std::runtime_error("unable to remove device root");
+    }
+    std::error_code ec;
+    auto removed = fs::remove_all(resolved, ec);
+    if (ec) {
+        logger.error() << "error removing " << resolved << ": " << ec.message();
         return 0;
     }
+    if (removed > 0) {
+        logger.info() << "removeAll " << resolved << ": " << removed;
+    }
+    return removed;
 }
 
 class StdfsPathsGenerator : public PathsGenerator {
diff --git a/src/io/devices/StdfsDevice.hpp b/src/io/devices/StdfsDevice.hpp
index 677cad25b..9259a9256 100644
--- a/src/io/devices/StdfsDevice.hpp
+++ b/src/io/devices/StdfsDevice.hpp
@@ -23,5 +23,6 @@ namespace io {
         std::unique_ptr<PathsGenerator> list(std::string_view path) override;
     private:
         std::filesystem::path root;
+        std::filesystem::path absoluteRoot;
     };
 }
diff --git a/src/io/io.cpp b/src/io/io.cpp
index 638108587..d550654e4 100644
--- a/src/io/io.cpp
+++ b/src/io/io.cpp
@@ -152,6 +152,9 @@ std::vector<ubyte> io::read_bytes(const path& filename) {
 std::string io::read_string(const path& filename) {
     size_t size;
     auto bytes = read_bytes(filename, size);
+    if (bytes == nullptr) {
+        throw std::runtime_error("could not read file " + filename.string());
+    }
     return std::string((const char*)bytes.get(), size);
 }
 
diff --git a/src/logic/scripting/lua/libs/libnetwork.cpp b/src/logic/scripting/lua/libs/libnetwork.cpp
index 59d50f075..0d48e4a29 100644
--- a/src/logic/scripting/lua/libs/libnetwork.cpp
+++ b/src/logic/scripting/lua/libs/libnetwork.cpp
@@ -266,8 +266,10 @@ static int l_peek(lua::State* L, network::Network& network) {
 static int l_available(lua::State* L, network::Network& network) {
     u64id_t id = lua::tointeger(L, 1);
 
-    if (auto connection = network.getConnection(id, false)) {
-        return lua::pushinteger(L, dynamic_cast<network::TcpConnection*>(connection)->available());
+    if (auto connection = dynamic_cast<network::ReadableConnection*>(
+            network.getConnection(id, false)
+        )) {
+        return lua::pushinteger(L, connection->available());
     }
 
     return 0;
diff --git a/src/logic/scripting/lua/lua_engine.cpp b/src/logic/scripting/lua/lua_engine.cpp
index 812f67665..1e73ea903 100644
--- a/src/logic/scripting/lua/lua_engine.cpp
+++ b/src/logic/scripting/lua/lua_engine.cpp
@@ -196,6 +196,10 @@ void lua::init_state(State* L, StateType stateType) {
     if (stateType == StateType::GENERATOR) {
         pushnil(L);
         setglobal(L, "ffi");
+
+        static const char* removed_debug[] {
+            "getregistry", "getupvalue", "setupvalue", "getinfo", nullptr};
+        remove_lib_funcs(L, "debug", removed_debug);
     }
 }
 
diff --git a/src/network/Curl.cpp b/src/network/Curl.cpp
index 0e08162fb..11afa5ae5 100644
--- a/src/network/Curl.cpp
+++ b/src/network/Curl.cpp
@@ -113,6 +113,14 @@ public:
 
         curl_easy_setopt(curl, CURLOPT_URL, request.url.c_str());
         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, request.method.c_str());
+
+#if LIBCURL_VERSION_NUM >= 0x075500
+        curl_easy_setopt(curl, CURLOPT_PROTOCOLS_STR, "http,https");
+        curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS_STR, "http,https");
+#else
+        curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
+        curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
+#endif
         
         curl_slist* hs = nullptr;