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Early filter invalid hosts in wp_http_validate_url() #10669

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Early filter invalid hosts in wp_http_validate_url() #10669

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b89bec6
HTTP API: Early filter invalid hosts in wp_http_validate_url()
manhphuc Dec 30, 2025
1439d45
Validate non-IP hostnames early in wp_http_validate_url
manhphuc Dec 30, 2025
fc38d7a
HTTP: Early reject invalid hostnames in wp_http_validate_url()
manhphuc Dec 30, 2025
6c7eccb
Tests: fix inline alignment to satisfy PHPCS
manhphuc Dec 30, 2025
d8d86bd
Tests: remove duplicate IP case and fix array formatting
manhphuc Dec 30, 2025
aa5990c
Tests: fix array alignment for PHPCS
manhphuc Dec 30, 2025
fe877fd
HTTP: compute IPv4 host earlier
manhphuc Dec 31, 2025
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17 changes: 16 additions & 1 deletion src/wp-includes/http.php
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Original file line number Diff line number Diff line change
Expand Up @@ -587,9 +587,24 @@ function wp_http_validate_url( $url ) {
$parsed_home = parse_url( get_option( 'home' ) );
$same_host = isset( $parsed_home['host'] ) && strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );
$host = trim( $parsed_url['host'], '.' );
$is_ipv4 = (bool) preg_match(
'#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#',
$host
);

if ( ! $same_host ) {
if ( preg_match( '#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', $host ) ) {
if (
! $is_ipv4
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@SirLouen SirLouen Dec 31, 2025 •
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@manhphuc I think you are shortcircuiting a little late
We have the $parse_url['host'] available much earlier.

Also, ipv4 will return a truthy value, so doing this won't be disruptive for such addresses
https://3v4l.org/Jau1h

I recommend you to debug a bit to set it in the best place. See what kind of values you are receiving earlier.

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@manhphuc manhphuc Dec 31, 2025

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Thanks for the suggestion!

I’ve moved the IPv4 detection to right after normalizing $host, so it’s available earlier and reused in the ! $same_host branch. This keeps the behavior unchanged for IPv4 addresses, while avoiding the later short-circuit.

Let me know if you’d prefer it even earlier in the function.

&& extension_loaded( 'filter' )
&& ! filter_var(
$host,
FILTER_VALIDATE_DOMAIN,
array( 'flags' => FILTER_FLAG_HOSTNAME )
)
) {
return false;
}
if ( $is_ipv4 ) {
$ip = $host;
} else {
$ip = gethostbyname( $host );
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3 changes: 3 additions & 0 deletions tests/phpunit/tests/http/http.php
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Original file line number Diff line number Diff line change
Expand Up @@ -566,6 +566,9 @@ public function data_wp_http_validate_url_should_not_validate() {
'url' => 'https://example.com:81/caniload.php',
'cb_safe_ports' => 'callback_remove_safe_ports',
),
'underscore_in_hostname' => array(
'url' => 'https://foo_bar.example.com/',
),
);
}

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