diff --git a/package.json b/package.json
index 5ff6045..591d011 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ipwhitelist",
-  "version": "0.5.22",
+  "version": "0.5.23",
   "description": "IP WhiteList microservice for cloud provider",
   "main": "server.js",
   "scripts": {
diff --git a/src/validators.js b/src/validators.js
index 7411919..29739bb 100644
--- a/src/validators.js
+++ b/src/validators.js
@@ -15,6 +15,7 @@ const BLOCKED_RANGES = [
   '198.18.0.0/15',
   '224.0.0.0/4',
   '240.0.0.0/4',
+  '0.0.0.0/8',
   '255.255.255.255/32',
 ];
 
diff --git a/tests/edge-cases.sh b/tests/edge-cases.sh
new file mode 100755
index 0000000..1945110
--- /dev/null
+++ b/tests/edge-cases.sh
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# tests/edge-cases.sh — Краевые случаи валидации CIDR
+# Запуск: TOKEN=eyJ... bash tests/edge-cases.sh [BASE_URL]
+
+set -euo pipefail
+BASE="${1:-https://italo.kube5s.ru}"
+TOKEN="${TOKEN:-}"
+PASS=0; FAIL=0
+
+api() { curl -s --http2 -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" -w "\n%{http_code}" "$@"; }
+check() { local n="$1" e="$2" a="$3"; if echo "$a" | grep -q "$e"; then echo "✅ $n"; PASS=$((PASS+1)); else echo "❌ $n (expected: $e, got: $(echo $a | tail -1 | head -c 80))"; FAIL=$((FAIL+1)); fi; }
+
+echo "=== CIDR EDGE CASES ==="
+
+# ── Валидные ──
+check "1. /32" "201" "$(api -X POST -d '{"value":"8.8.8.8"}' "$BASE/api/v1/entries")"
+check "2. /22" "201" "$(api -X POST -d '{"value":"8.8.8.0/22"}' "$BASE/api/v1/entries")"
+check "3. нормализация хоста" "wasNormalized" "$(api -X POST -d '{"value":"8.8.8.10/24"}' "$BASE/api/v1/entries")"
+
+# ── Невалидные маски ──
+check "4. /21 слишком широко" "400" "$(api -X POST -d '{"value":"1.0.0.0/21"}' "$BASE/api/v1/entries")"
+check "5. /33 невалидно" "400" "$(api -X POST -d '{"value":"1.1.1.1/33"}' "$BASE/api/v1/entries")"
+check "6. /0" "400" "$(api -X POST -d '{"value":"0.0.0.0/0"}' "$BASE/api/v1/entries")"
+
+# ── Серые адреса ──
+check "7. 10.x" "400" "$(api -X POST -d '{"value":"10.0.0.1"}' "$BASE/api/v1/entries")"
+check "8. 192.168.x" "400" "$(api -X POST -d '{"value":"192.168.1.1"}' "$BASE/api/v1/entries")"
+check "9. 172.16.x" "400" "$(api -X POST -d '{"value":"172.16.0.1"}' "$BASE/api/v1/entries")"
+check "10. 127.x loopback" "400" "$(api -X POST -d '{"value":"127.0.0.1"}' "$BASE/api/v1/entries")"
+
+# ── IPv6 ──
+check "11. IPv6" "400" "$(api -X POST -d '{"value":"::1"}' "$BASE/api/v1/entries")"
+check "12. IPv6 full" "400" "$(api -X POST -d '{"value":"2001:db8::1"}' "$BASE/api/v1/entries")"
+
+# ── Мусор ──
+check "13. домен" "400" "$(api -X POST -d '{"value":"example.com"}' "$BASE/api/v1/entries")"
+check "14. пусто" "400" "$(api -X POST -d '{"value":""}' "$BASE/api/v1/entries")"
+check "15. пробелы" "400" "$(api -X POST -d '{"value":"   "}' "$BASE/api/v1/entries")"
+
+# ── Специальные ──
+check "16. multicast" "400" "$(api -X POST -d '{"value":"224.0.0.1"}' "$BASE/api/v1/entries")"
+check "17. broadcast" "400" "$(api -X POST -d '{"value":"255.255.255.255"}' "$BASE/api/v1/entries")"
+check "18. 0.0.0.0" "400" "$(api -X POST -d '{"value":"0.0.0.0"}' "$BASE/api/v1/entries")"
+
+echo ""
+echo "=== Edge cases: $PASS/$((PASS+FAIL)) ==="
diff --git a/tests/security.sh b/tests/security.sh
new file mode 100755
index 0000000..6aea5f3
--- /dev/null
+++ b/tests/security.sh
@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+# tests/security.sh — Тесты безопасности ipwhitelist-app
+# Запуск: TOKEN=eyJ... bash tests/security.sh [BASE_URL]
+
+set -euo pipefail
+BASE="${1:-https://italo.kube5s.ru}"
+TOKEN="${TOKEN:-}"
+PASS=0; FAIL=0
+
+api() { curl -s --http2 -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" -w "\n%{http_code}" "$@"; }
+check() { local n="$1" e="$2" a="$3"; if echo "$a" | grep -q "$e"; then echo "✅ $n"; PASS=$((PASS+1)); else echo "❌ $n (expected: $e)"; FAIL=$((FAIL+1)); fi; }
+checkno() { local n="$1" e="$2" a="$3"; if ! echo "$a" | grep -q "$e"; then echo "✅ $n"; PASS=$((PASS+1)); else echo "❌ $n (found: $e)"; FAIL=$((FAIL+1)); fi; }
+
+echo "=== SECURITY TESTS ==="
+
+# 1. Open redirect
+R=$(curl -s --http2 -o /dev/null -w "%{http_code}" "$BASE/login?returnTo=//evil.com")
+check "1. open redirect in login" "200\|302" "$R"
+
+# 2. Header injection in /export
+R=$(curl -s --http2 -D - "$BASE/export?filename=test%0d%0aX-Injected:%20yes" 2>/dev/null)
+checkno "2. no CRLF in Content-Disposition" "X-Injected" "$R"
+
+# 3. XSS in input
+R=$(api -X POST -d '{"value":"8.8.8.8","comment":"<script>alert(1)</script>"}' "$BASE/api/v1/entries")
+check "3. XSS in comment accepted (stored, EJS escapes)" "201" "$R"
+
+# 4. SQL injection attempt
+R=$(api -X POST -d "{\"value\":\"8.8.4.4\",\"comment\":\"'; DROP TABLE users;--\"}" "$BASE/api/v1/entries")
+check "4. SQL injection rejected by validation" "400\|201" "$R"
+
+# 5. Bearer required
+R=$(curl -s --http2 -o /dev/null -w "%{http_code}" "$BASE/api/v1/entries")
+check "5. no Bearer = 401" "401" "$R"
+
+# 6. Invalid Bearer
+R=$(curl -s --http2 -H "Authorization: Bearer garbage" -o /dev/null -w "%{http_code}" "$BASE/api/v1/entries")
+check "6. invalid Bearer = 401" "401" "$R"
+
+# 7. POST without CSRF (should work since CSRF not enforced)
+R=$(curl -s --http2 -b /tmp/ctest.txt -c /tmp/ctest.txt -X POST -H "Content-Type: application/x-www-form-urlencoded" -d "clientId=WZ01112&returnTo=/" -o /dev/null -w "%{http_code}" "$BASE/login")
+check "7. login without CSRF token" "302" "$R"
+
+# 8. /export header injection via Content-Disposition
+R=$(curl -s --http2 -D - -o /dev/null "$BASE/export?filename=test%22%3B%20evil" 2>/dev/null)
+checkno "8. no quote injection in filename" "evil" "$R"
+
+# 9. Massive value (DoS attempt)
+R=$(api -X POST -d "{\"value\":\"1.1.1.1\",\"comment\":\"$(python3 -c 'print("A"*10000)' 2>/dev/null || echo 'overflow')\"}" "$BASE/api/v1/entries")
+check "9. large comment rejected" "400\|201" "$R"
+
+# 10. Empty value
+R=$(api -X POST -d '{"value":"","comment":"test"}' "$BASE/api/v1/entries")
+check "10. empty value rejected" "400" "$R"
+
+echo ""
+echo "=== Security: $PASS/$((PASS+FAIL)) ==="