diff --git a/ext/phar/phar.c b/ext/phar/phar.c
index 98e90c9ab93..af540a520cc 100644
--- a/ext/phar/phar.c
+++ b/ext/phar/phar.c
@@ -1635,7 +1635,8 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 	const char zip_magic[] = "PK\x03\x04";
 	const char gz_magic[] = "\x1f\x8b\x08";
 	const char bz_magic[] = "BZh";
-	char *pos, test = '\0';
+	char *pos;
+	int recursion_count = 3; // arbitrary limit to avoid too deep or even infinite recursion
 	const int window_size = 1024;
 	char buffer[1024 + sizeof(token)]; /* a 1024 byte window + the size of the halt_compiler token (moving window) */
 	const zend_long readsize = sizeof(buffer) - sizeof(token);
@@ -1663,8 +1664,7 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 			MAPPHAR_ALLOC_FAIL("internal corruption of phar \"%s\" (truncated entry)")
 		}
 
-		if (!test) {
-			test = '\1';
+		if (recursion_count) {
 			pos = buffer+tokenlen;
 			if (!memcmp(pos, gz_magic, 3)) {
 				char err = 0;
@@ -1724,7 +1724,10 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 				compression = PHAR_FILE_COMPRESSED_GZ;
 
 				/* now, start over */
-				test = '\0';
+				if (!--recursion_count) {
+					MAPPHAR_ALLOC_FAIL("unable to decompress gzipped phar archive \"%s\"");
+					break;
+				}
 				continue;
 			} else if (!memcmp(pos, bz_magic, 3)) {
 				php_stream_filter *filter;
@@ -1762,7 +1765,10 @@ static int phar_open_from_fp(php_stream* fp, char *fname, size_t fname_len, char
 				compression = PHAR_FILE_COMPRESSED_BZ2;
 
 				/* now, start over */
-				test = '\0';
+				if (!--recursion_count) {
+					MAPPHAR_ALLOC_FAIL("unable to decompress bzipped phar archive \"%s\"");
+					break;
+				}
 				continue;
 			}
 
diff --git a/ext/phar/tests/bug81726.gz b/ext/phar/tests/bug81726.gz
new file mode 100644
index 00000000000..67b41ba3b65
Binary files /dev/null and b/ext/phar/tests/bug81726.gz differ
diff --git a/ext/phar/tests/bug81726.phpt b/ext/phar/tests/bug81726.phpt
new file mode 100644
index 00000000000..11a148c28ea
--- /dev/null
+++ b/ext/phar/tests/bug81726.phpt
@@ -0,0 +1,14 @@
+--TEST--
+Bug #81726 (phar wrapper: DOS when using quine gzip file)
+--SKIPIF--
+<?php
+if (!extension_loaded("phar")) die("skip phar extension not available");
+if (!extension_loaded("zlib")) die("skip zlib extension not available");
+?>
+--FILE--
+<?php
+var_dump(fopen("phar://" . __DIR__ . "/bug81726.gz", "r"));
+?>
+--EXPECTF--
+Warning: fopen(phar://%s): failed to open stream: unable to decompress gzipped phar archive "%s" in %s on line %d
+bool(false)
diff --git a/ext/standard/tests/bug81727.phpt b/ext/standard/tests/bug81727.phpt
new file mode 100644
index 00000000000..71a9cb46c83
--- /dev/null
+++ b/ext/standard/tests/bug81727.phpt
@@ -0,0 +1,15 @@
+--TEST--
+Bug #81727: $_COOKIE name starting with ..Host/..Secure should be discarded
+--COOKIE--
+..Host-test=ignore; __Host-test=correct; . Secure-test=ignore; . Elephpant=Awesome;
+--FILE--
+<?php
+var_dump($_COOKIE);
+?>
+--EXPECT--
+array(2) {
+  ["__Host-test"]=>
+  string(7) "correct"
+  ["__Elephpant"]=>
+  string(7) "Awesome"
+}
diff --git a/main/php_variables.c b/main/php_variables.c
index 6a8ff5e1f09..27a9ad089e7 100644
--- a/main/php_variables.c
+++ b/main/php_variables.c
@@ -104,6 +104,20 @@ PHPAPI void php_register_variable_ex(const char *var_name, zval *val, zval *trac
 	}
 	var_len = p - var;
 
+	/* Discard variable if mangling made it start with __Host-, where pre-mangling it did not start with __Host- */
+	if (strncmp(var, "__Host-", sizeof("__Host-")-1) == 0 && strncmp(var_name, "__Host-", sizeof("__Host-")-1) != 0) {
+		zval_ptr_dtor_nogc(val);
+		free_alloca(var_orig, use_heap);
+		return;
+	}
+
+	/* Discard variable if mangling made it start with __Secure-, where pre-mangling it did not start with __Secure- */
+	if (strncmp(var, "__Secure-", sizeof("__Secure-")-1) == 0 && strncmp(var_name, "__Secure-", sizeof("__Secure-")-1) != 0) {
+		zval_ptr_dtor_nogc(val);
+		free_alloca(var_orig, use_heap);
+		return;
+	}
+
 	if (var_len==0) { /* empty variable name, or variable name with a space in it */
 		zval_ptr_dtor_nogc(val);
 		free_alloca(var_orig, use_heap);