diff --git a/ext/standard/string.c b/ext/standard/string.c
index 47b4f60f0fe..b47319be310 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -1429,7 +1429,7 @@ PHPAPI void php_basename(const char *s, size_t len, char *suffix, size_t sufflen
 				goto quit_loop;
 			case 1:
 #if defined(PHP_WIN32) || defined(NETWARE)
-				if (*c == '/' || *c == '\\' || (*c == ':' && (c - s == 1))) {
+				if (*c == '/' || *c == '\\') {
 #else
 				if (*c == '/') {
 #endif
@@ -1437,6 +1437,19 @@ PHPAPI void php_basename(const char *s, size_t len, char *suffix, size_t sufflen
 						state = 0;
 						cend = c;
 					}
+#if defined(PHP_WIN32) || defined(NETWARE)
+				/* Catch relative paths in c:file.txt style. They're not to confuse
+				   with the NTFS streams. This part ensures also, that no drive 
+				   letter traversing happens. */
+				} else if ((*c == ':' && (c - comp == 1))) {
+					if (state == 0) {
+						comp = c;
+						state = 1;
+					} else {
+						cend = c;
+						state = 0;
+					}
+#endif
 				} else {
 					if (state == 0) {
 						comp = c;
diff --git a/ext/standard/tests/file/basename_bug66395_variation2-win32.phpt b/ext/standard/tests/file/basename_bug66395_variation2-win32.phpt
new file mode 100644
index 00000000000..05df79b02a0
--- /dev/null
+++ b/ext/standard/tests/file/basename_bug66395_variation2-win32.phpt
@@ -0,0 +1,36 @@
+--TEST--
+basename bug #66395 check drive traversing and NTFS streams
+--SKIPIF--
+<?php if (substr(PHP_OS, 0, 3) != 'WIN') { die('skip Windows only basename tests'); } ?>
+--FILE--
+<?php
+echo basename("y:") . "\n";
+echo basename("y:/") . "\n";
+echo basename("notdriveletter:file.txt") . "\n";
+echo basename("a:\\b:c:d:hello.txt\\hcd:c.txt") . "\n";
+echo basename("a:b:c:d:hello.txt\\d:some.txt") . "\n";
+echo basename("a:b:c:d:hello\world\a.bmp\c:d:e:f.txt") . "\n";
+echo basename("a:\\b:\\c:d:hello\\world\\a.bmp\\d:e:f:g.txt") . "\n";
+echo basename("a:\\b:\\c:d:hello/world\\a.bmp\\d:\\e:\\f:g.txt") . "\n";
+echo basename("a:\\b:/c:d:hello\\world:somestream") . "\n";
+echo basename("a:\\b:\\c:d:hello\\world:some.stream") . "\n";
+echo basename("a:/b:\\c:d:hello\\world:some.stream:\$DATA") . "\n";
+echo basename("x:y:z:hello\world:my.stream:\$DATA") . "\n";
+echo basename("a:\\b:\\c:d:hello\\world:c:\$DATA") . "\n";
+?>
+==DONE==
+--EXPECTF--
+y
+y
+notdriveletter:file.txt
+hcd:c.txt
+some.txt
+f.txt
+g.txt
+g.txt
+world:somestream
+world:some.stream
+world:some.stream:$DATA
+world:my.stream:$DATA
+world:c:$DATA
+==DONE==