diff --git a/cache/src/test/java/dev/openrs2/cache/Js5CompressionTest.kt b/cache/src/test/java/dev/openrs2/cache/Js5CompressionTest.kt
index 723e4fd184..eb86f32087 100644
--- a/cache/src/test/java/dev/openrs2/cache/Js5CompressionTest.kt
+++ b/cache/src/test/java/dev/openrs2/cache/Js5CompressionTest.kt
@@ -4,6 +4,8 @@ import dev.openrs2.buffer.use
 import dev.openrs2.crypto.XteaKey
 import io.netty.buffer.ByteBuf
 import io.netty.buffer.Unpooled
+import org.junit.jupiter.api.assertThrows
+import java.io.EOFException
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNotEquals
@@ -255,6 +257,69 @@ object Js5CompressionTest {
         }
     }
 
+    @Test
+    fun testInvalidType() {
+        read("invalid-type.dat").use { compressed ->
+            assertThrows<IllegalArgumentException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
+    @Test
+    fun testInvalidLength() {
+        read("invalid-length.dat").use { compressed ->
+            assertThrows<IllegalArgumentException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
+    @Test
+    fun testInvalidUncompressedLength() {
+        read("invalid-uncompressed-length.dat").use { compressed ->
+            assertThrows<IllegalArgumentException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
+    @Test
+    fun testNoneEof() {
+        read("none-eof.dat").use { compressed ->
+            assertThrows<IndexOutOfBoundsException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
+    @Test
+    fun testBzip2Eof() {
+        read("bzip2-eof.dat").use { compressed ->
+            assertThrows<EOFException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
+    @Test
+    fun testGzipEof() {
+        read("gzip-eof.dat").use { compressed ->
+            assertThrows<EOFException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
+    @Test
+    fun testLzmaEof() {
+        read("lzma-eof.dat").use { compressed ->
+            assertThrows<EOFException> {
+                Js5Compression.uncompress(compressed).release()
+            }
+        }
+    }
+
     private fun read(name: String): ByteBuf {
         Js5CompressionTest::class.java.getResourceAsStream("compression/$name").use { input ->
             return Unpooled.wrappedBuffer(input.readAllBytes())
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/bzip2-eof.dat b/cache/src/test/resources/dev/openrs2/cache/compression/bzip2-eof.dat
new file mode 100644
index 0000000000..9909b51462
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/bzip2-eof.dat differ
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/gzip-eof.dat b/cache/src/test/resources/dev/openrs2/cache/compression/gzip-eof.dat
new file mode 100644
index 0000000000..87bee8557c
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/gzip-eof.dat differ
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/invalid-length.dat b/cache/src/test/resources/dev/openrs2/cache/compression/invalid-length.dat
new file mode 100644
index 0000000000..645f49c466
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/invalid-length.dat differ
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/invalid-type.dat b/cache/src/test/resources/dev/openrs2/cache/compression/invalid-type.dat
new file mode 100644
index 0000000000..4499cd8403
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/invalid-type.dat differ
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/invalid-uncompressed-length.dat b/cache/src/test/resources/dev/openrs2/cache/compression/invalid-uncompressed-length.dat
new file mode 100644
index 0000000000..c072da9e26
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/invalid-uncompressed-length.dat differ
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/lzma-eof.dat b/cache/src/test/resources/dev/openrs2/cache/compression/lzma-eof.dat
new file mode 100644
index 0000000000..dcd4e5eaeb
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/lzma-eof.dat differ
diff --git a/cache/src/test/resources/dev/openrs2/cache/compression/none-eof.dat b/cache/src/test/resources/dev/openrs2/cache/compression/none-eof.dat
new file mode 100644
index 0000000000..fa2e414ed7
Binary files /dev/null and b/cache/src/test/resources/dev/openrs2/cache/compression/none-eof.dat differ