diff --git a/src/native/basic/native_basic.cpp b/src/native/basic/native_basic.cpp
index 5a6fa54..b56a01c 100644
--- a/src/native/basic/native_basic.cpp
+++ b/src/native/basic/native_basic.cpp
@@ -85,7 +85,9 @@ struct IpairsState {
 // 辅助：比较 key 是否相等
 static bool KeysEqual(CVar a, CVar b) {
     if (a.type_ == b.type_) {
-        if (b.type_ == static_cast<int>(VarType::Int) || b.type_ == static_cast<int>(VarType::Bool)) return a.data_.i == b.data_.i;
+        // Bool only writes data_.b; comparing data_.i can see stale union bytes.
+        if (b.type_ == static_cast<int>(VarType::Bool)) return a.data_.b == b.data_.b;
+        if (b.type_ == static_cast<int>(VarType::Int)) return a.data_.i == b.data_.i;
         if (b.type_ == static_cast<int>(VarType::Float)) return a.data_.f == b.data_.f;
         if (b.type_ == static_cast<int>(VarType::StringId)) return a.data_.i == b.data_.i;
         if (b.type_ == static_cast<int>(VarType::String)) {
diff --git a/src/native/container/native_container.cpp b/src/native/container/native_container.cpp
index 1cd6fd6..10cb1ba 100644
--- a/src/native/container/native_container.cpp
+++ b/src/native/container/native_container.cpp
@@ -10,6 +10,7 @@
 #include <boost/container/list.hpp>
 #include <boost/container/small_vector.hpp>
 #include <boost/container/vector.hpp>
+#include <cmath>
 #include <cstdint>
 #include <format>
 #include <iterator>
@@ -96,7 +97,14 @@ struct ContainerKey {
             case Kind::Int:
                 return a.i < b.i;
             case Kind::Float:
-                return a.f < b.f;
+                // NaN breaks strict weak ordering (a<b and b<a both false vs self).
+                // Sort all NaNs after non-NaN floats; NaNs compare equal to each other.
+                {
+                    const bool a_nan = std::isnan(a.f);
+                    const bool b_nan = std::isnan(b.f);
+                    if (a_nan || b_nan) return !a_nan && b_nan;
+                    return a.f < b.f;
+                }
             case Kind::String:
                 return a.s < b.s;
         }
diff --git a/src/native/crypto/crypto_cipher.cpp b/src/native/crypto/crypto_cipher.cpp
index efc8544..599924a 100644
--- a/src/native/crypto/crypto_cipher.cpp
+++ b/src/native/crypto/crypto_cipher.cpp
@@ -38,7 +38,10 @@ std::vector<uint8_t> Rc4(const uint8_t *key, size_t key_len, const uint8_t *data
         }
     }
     int final_len = 0;
-    EVP_EncryptFinal_ex(ctx, out.data() + outlen, &final_len);
+    if (EVP_EncryptFinal_ex(ctx, out.data() + outlen, &final_len) != 1) {
+        EVP_CIPHER_CTX_free(ctx);
+        ThrowFakeluaException("rc4: EVP_EncryptFinal_ex failed");
+    }
 
     EVP_CIPHER_CTX_free(ctx);
     return out;
diff --git a/src/native/http/native_http.cpp b/src/native/http/native_http.cpp
index 4ce23db..142b862 100644
--- a/src/native/http/native_http.cpp
+++ b/src/native/http/native_http.cpp
@@ -23,6 +23,7 @@
 #include <cctype>
 #include <cstdlib>
 #include <cstring>
+#include <limits>
 #include <stdexcept>
 #if defined(_WIN32)
 #define strcasecmp _stricmp
@@ -206,8 +207,13 @@ static bool TryParseHttpMessage(std::string &buf, bool request, HttpRequestData
     std::string cl = HeaderGet(hdrs, "Content-Length");
     size_t body_off = hdr_end + 4;
     if (!cl.empty()) {
-        size_t n = static_cast<size_t>(std::strtoull(cl.c_str(), nullptr, 10));
-        if (buf.size() < body_off + n) return false;
+        // Reject non-decimal / overflow so body_off + n cannot wrap.
+        char *end = nullptr;
+        unsigned long long parsed = std::strtoull(cl.c_str(), &end, 10);
+        if (end == cl.c_str() || *end != '\0') return false;
+        if (parsed > std::numeric_limits<size_t>::max() - body_off) return false;
+        size_t n = static_cast<size_t>(parsed);
+        if (buf.size() < body_off || buf.size() - body_off < n) return false;
         if (body) *body = buf.substr(body_off, n);
         if (req) req->body = buf.substr(body_off, n);
         buf.erase(0, body_off + n);
@@ -995,9 +1001,11 @@ static CVar HttpServerFn(State *s, CVar *args, int n) {
     auto *srv = new HttpServer(s);
     srv->SetNativeObject(nat);
     try {
+        // Listen takes ownership of tls_ctx immediately (stores in ssl_ctx_).
+        // On failure, ~HttpServer/Close frees it — do not SSL_CTX_free here.
         srv->Listen(ip, port, backlog, timeout_ms, tls_ctx);
+        tls_ctx = nullptr;
     } catch (const std::exception &e) {
-        if (tls_ctx) SSL_CTX_free(tls_ctx);
         delete srv;
         s->GetNativeObjectManager().DestroyGroup(gid);
         ThrowFakeluaException(std::string("http.server: ") + e.what());
diff --git a/src/native/ini/native_ini.cpp b/src/native/ini/native_ini.cpp
index 025fbbd..05c85e3 100644
--- a/src/native/ini/native_ini.cpp
+++ b/src/native/ini/native_ini.cpp
@@ -166,8 +166,13 @@ static CVar IniEncode(State *s, CVar *args, int n) {
                 // INI has no nested tables; encode array as comma-separated
                 auto arr_kvs = table::TableHelper::CollectKVPairs(skv.val);
                 std::sort(arr_kvs.begin(), arr_kvs.end(), [](const table::TableKV &a, const table::TableKV &b) {
-                    if (a.key.type_ == static_cast<int>(VarType::Int) && b.key.type_ == static_cast<int>(VarType::Int)) return a.key.data_.i < b.key.data_.i;
-                    return false;
+                    const bool a_int = a.key.type_ == static_cast<int>(VarType::Int);
+                    const bool b_int = b.key.type_ == static_cast<int>(VarType::Int);
+                    // Integer keys first (array part), then others by string form —
+                    // keeps a total order for mixed Int/String section values.
+                    if (a_int && b_int) return a.key.data_.i < b.key.data_.i;
+                    if (a_int != b_int) return a_int;
+                    return inter::FakeluaToNativeString(nullptr, a.key) < inter::FakeluaToNativeString(nullptr, b.key);
                 });
                 for (size_t i = 0; i < arr_kvs.size(); i++) {
                     if (i > 0) out += ", ";
diff --git a/src/native/json/native_json.cpp b/src/native/json/native_json.cpp
index 6b42def..b504da5 100644
--- a/src/native/json/native_json.cpp
+++ b/src/native/json/native_json.cpp
@@ -5,7 +5,9 @@
 
 #include <algorithm>
 #include <boost/json.hpp>
+#include <limits>
 #include <string>
+#include <string_view>
 #include <unordered_set>
 
 namespace fakelua::json {
@@ -46,15 +48,20 @@ static CVar JsonValueToLua(State *s, const bj::value &v) {
         return inter::NativeToFakeluaLonglong(s, v.get_int64());
     }
     if (v.is_uint64()) {
-        // Lua numbers are signed; but we can still represent up to 2^63-1 as positive.
-        // For values > 2^63-1, we could convert to double, but keep simple.
-        return inter::NativeToFakeluaLonglong(s, static_cast<int64_t>(v.get_uint64()));
+        const uint64_t u = v.get_uint64();
+        // Keep exact integers in int64 range; larger values become double
+        // (lossy above 2^53) instead of wrapping to a negative int64.
+        if (u <= static_cast<uint64_t>(std::numeric_limits<int64_t>::max())) {
+            return inter::NativeToFakeluaLonglong(s, static_cast<int64_t>(u));
+        }
+        return inter::NativeToFakeluaDouble(s, static_cast<double>(u));
     }
     if (v.is_double()) {
         return inter::NativeToFakeluaDouble(s, v.get_double());
     }
     if (v.is_string()) {
-        return inter::NativeToFakeluaString(s, v.get_string().c_str());
+        const auto &js = v.get_string();
+        return inter::NativeToFakeluaStringView(s, std::string_view(js.data(), js.size()));
     }
     if (v.is_array()) {
         CVar tbl = table::TableHelper::CreateTable(s);
diff --git a/src/native/net/net_buffer.cpp b/src/native/net/net_buffer.cpp
index 3e1a852..f30f892 100644
--- a/src/native/net/net_buffer.cpp
+++ b/src/native/net/net_buffer.cpp
@@ -305,25 +305,36 @@ bool TryParsePacket(CircularBuffer &buf, const NetConfig &cfg, const char *&out_
         case FramerType::LineDelimiter: {
             if (buf.Empty()) return false;
             size_t total = buf.Size();
-            if (total > static_cast<size_t>(cfg.max_packet_len)) {
-                // 超过 max_packet_len 仍未见到换行符，视为恶意/异常连接
-                out_error = true;
-                return false;
+            // Only scan up to max_packet_len+1: a complete short line may sit at
+            // the front while later bytes push total past max_packet_len.
+            size_t scan = total;
+            if (cfg.max_packet_len > 0) {
+                scan = std::min(total, static_cast<size_t>(cfg.max_packet_len) + 1);
             }
-            if (parse_tmp.size() < total) parse_tmp.resize(total);
-            buf.Peek(parse_tmp.data(), total);
+            if (parse_tmp.size() < scan) parse_tmp.resize(scan);
+            buf.Peek(parse_tmp.data(), scan);
 
             // 查找 '\n'
             size_t line_end = 0;
             bool found = false;
-            for (size_t i = 0; i < total; ++i) {
+            for (size_t i = 0; i < scan; ++i) {
                 if (parse_tmp[i] == '\n') {
                     line_end = i;
                     found = true;
                     break;
                 }
             }
-            if (!found) return false;
+            if (!found) {
+                // No newline in the first max_packet_len(+1) bytes → oversize line
+                if (cfg.max_packet_len > 0 && total > static_cast<size_t>(cfg.max_packet_len)) {
+                    out_error = true;
+                }
+                return false;
+            }
+            if (cfg.max_packet_len > 0 && line_end > static_cast<size_t>(cfg.max_packet_len)) {
+                out_error = true;
+                return false;
+            }
 
             // 消费包含 '\n' 在内的所有字节
             buf.Read(parse_tmp.data(), line_end + 1);
diff --git a/test/lua/json/test_json_edge.lua b/test/lua/json/test_json_edge.lua
index d157025..017305c 100644
--- a/test/lua/json/test_json_edge.lua
+++ b/test/lua/json/test_json_edge.lua
@@ -308,3 +308,24 @@ function test_encode_large_int_key()
     if not string.find(s, "9999999") then return 0 end
     return 1
 end
+
+-- uint64 > INT64_MAX must not wrap to a negative int64
+function test_decode_uint64_overflow()
+    local v = json.decode("9223372036854775808")
+    if type(v) ~= "number" then return 0 end
+    if v < 0 then return 0 end
+    -- Exact int64 can't hold 2^63; expect double approximation
+    if v < 9.223372036854e18 then return 0 end
+    return 1
+end
+
+-- JSON strings may contain embedded NUL via \u0000
+function test_decode_embedded_nul()
+    local v = json.decode('"a\\u0000b"')
+    if type(v) ~= "string" then return 0 end
+    if #v ~= 3 then return 0 end
+    if string.byte(v, 1) ~= 97 then return 0 end
+    if string.byte(v, 2) ~= 0 then return 0 end
+    if string.byte(v, 3) ~= 98 then return 0 end
+    return 1
+end
diff --git a/test/test_json.cpp b/test/test_json.cpp
index e62aa4c..b970d4e 100644
--- a/test/test_json.cpp
+++ b/test/test_json.cpp
@@ -682,3 +682,25 @@ TEST(test_json, encode_large_int_key) {
     EXPECT_EQ(ret, 1);
     FakeluaDeleteState(s);
 }
+
+TEST(test_json, decode_uint64_overflow) {
+    State *s = FakeluaNewState();
+    ASSERT_NE(s, nullptr);
+    CompileConfig config;
+    CompileFile(s, "./json/test_json_edge.lua", config);
+    int64_t ret = 0;
+    CallAll(s, "JsonTest.test_decode_uint64_overflow", ret);
+    EXPECT_EQ(ret, 1);
+    FakeluaDeleteState(s);
+}
+
+TEST(test_json, decode_embedded_nul) {
+    State *s = FakeluaNewState();
+    ASSERT_NE(s, nullptr);
+    CompileConfig config;
+    CompileFile(s, "./json/test_json_edge.lua", config);
+    int64_t ret = 0;
+    CallAll(s, "JsonTest.test_decode_embedded_nul", ret);
+    EXPECT_EQ(ret, 1);
+    FakeluaDeleteState(s);
+}