From 72d3fb0034dbbfcd0a753b3b2cb2e5a9268060aa Mon Sep 17 00:00:00 2001
From: jonsurrell <jonsurrell@git.wordpress.org>
Date: Fri, 27 Feb 2026 13:06:44 +0000
Subject: [PATCH] HTML API: Prevent bookmark exhaustion from throwing.

When bookmark exhaustion occurs during processing, return `false` instead of throwing an `Exception`.

Developed in https://github.com/WordPress/wordpress-develop/pull/10616.

Props jonsurrell, westonruter, dmsnell.
Fixes #64394.

Built from https://develop.svn.wordpress.org/trunk@61755


git-svn-id: http://core.svn.wordpress.org/trunk@61061 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 .../html-api/class-wp-html-processor.php      | 19 ++++++++++++++++++-
 wp-includes/version.php                       |  2 +-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/wp-includes/html-api/class-wp-html-processor.php b/wp-includes/html-api/class-wp-html-processor.php
index 8a63353787..f9a449c3c6 100644
--- a/wp-includes/html-api/class-wp-html-processor.php
+++ b/wp-includes/html-api/class-wp-html-processor.php
@@ -1042,8 +1042,17 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 		$token_name            = $this->get_token_name();
 
 		if ( self::REPROCESS_CURRENT_NODE !== $node_to_process ) {
+			try {
+				$bookmark_name = $this->bookmark_token();
+			} catch ( Exception $e ) {
+				if ( self::ERROR_EXCEEDED_MAX_BOOKMARKS === $this->last_error ) {
+					return false;
+				}
+				throw $e;
+			}
+
 			$this->state->current_token = new WP_HTML_Token(
-				$this->bookmark_token(),
+				$bookmark_name,
 				$token_name,
 				$this->has_self_closing_flag(),
 				$this->release_internal_bookmark_on_destruct
@@ -1153,6 +1162,12 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 			 * otherwise might involve messier calling and return conventions.
 			 */
 			return false;
+		} catch ( Exception $e ) {
+			if ( self::ERROR_EXCEEDED_MAX_BOOKMARKS === $this->last_error ) {
+				return false;
+			}
+			// Rethrow any other exceptions for higher-level handling.
+			throw $e;
 		}
 	}
 
@@ -6315,6 +6330,8 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 *
 	 * @since 6.7.0
 	 *
+	 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document.
+	 *
 	 * @param string      $token_name    Name of token to create and insert into the stack of open elements.
 	 * @param string|null $bookmark_name Optional. Name to give bookmark for created virtual node.
 	 *                                   Defaults to auto-creating a bookmark name.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ffb04ca788..a315c53c95 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-beta2-61754';
+$wp_version = '7.0-beta2-61755';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.