diff --git a/ext/standard/http_fopen_wrapper.c b/ext/standard/http_fopen_wrapper.c
index bf0363fd3cca4..d6d98fee76276 100644
--- a/ext/standard/http_fopen_wrapper.c
+++ b/ext/standard/http_fopen_wrapper.c
@@ -69,7 +69,7 @@
 
 #include "php_fopen_wrappers.h"
 
-#define HTTP_HEADER_BLOCK_SIZE		1024
+#define HTTP_HEADER_BLOCK_SIZE		2024
 #define PHP_URL_REDIRECT_MAX		20
 #define HTTP_HEADER_USER_AGENT		1
 #define HTTP_HEADER_HOST			2
@@ -741,7 +741,15 @@ static php_stream *php_stream_url_wrap_http_ex(php_stream_wrapper *wrapper,
 			char *e = http_header_line + http_header_line_length - 1;
 			char *http_header_value;
 			if (*e != '\n') {
-				do { /* partial header */
+				/* fail on overlong Location header */
+				if (!strncasecmp(http_header_line, "Location:", sizeof("Location:")-1)) {
+					php_stream_close(stream);
+					stream = NULL;
+					php_stream_wrapper_log_error(wrapper, options, "Location header too long");
+					goto out;
+				}
+				/* silently discard other overlong headers */
+				do {
 					if (php_stream_get_line(stream, http_header_line, HTTP_HEADER_BLOCK_SIZE, &http_header_line_length) == NULL) {
 						php_stream_wrapper_log_error(wrapper, options, "Failed to read HTTP headers");
 						goto out;
diff --git a/ext/standard/tests/http/bug78719.phpt b/ext/standard/tests/http/bug78719.phpt
new file mode 100644
index 0000000000000..e5e3362cb2ac0
--- /dev/null
+++ b/ext/standard/tests/http/bug78719.phpt
@@ -0,0 +1,33 @@
+--TEST--
+Bug #78719 (http wrapper silently ignores long Location headers)
+--SKIPIF--
+<?php require 'server.inc'; http_server_skipif('tcp://127.0.0.1:12342'); ?>
+--INI--
+allow_url_fopen=1
+--FILE--
+<?php
+require 'server.inc';
+
+$url = str_repeat('*', 1024);
+$responses = array(
+	"data://text/plain,HTTP/1.0 302 Ok\r\nLocation: $url\r\n\r\nBody",
+	"data://text/plain,HTTP/1.0 302 Ok\r\nLocation: $url$url\r\n\r\nBody",
+);
+
+$pid = http_server("tcp://127.0.0.1:12342", $responses, $output);
+
+function test() {
+    $context = stream_context_create(['http' => ['follow_location' => 0]]);
+    $f = file_get_contents('http://127.0.0.1:12342/', false, $context);
+    var_dump($f);
+}
+test();
+test();
+
+http_server_kill($pid);
+?>
+--EXPECTF--
+string(4) "Body"
+
+Warning: file_get_contents(http://127.0.0.1:12342/): failed to open stream: Location header too long in %s on line %d
+bool(false)