From c337487111095785147d4d99d635cecc4dfc8887 Mon Sep 17 00:00:00 2001
From: Artemis Tosini <me@artem.ist>
Date: Fri, 22 May 2026 08:43:16 +0000
Subject: [PATCH] Allow HTML `lang` attribute in remote posts (#39114)

---
 lib/sanitize_ext/sanitize_config.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/sanitize_ext/sanitize_config.rb b/lib/sanitize_ext/sanitize_config.rb
index ab166f52a8..f30eec476c 100644
--- a/lib/sanitize_ext/sanitize_config.rb
+++ b/lib/sanitize_ext/sanitize_config.rb
@@ -107,6 +107,7 @@ class Sanitize
       elements: %w(p br span a del s pre blockquote code b strong u i em ul ol li ruby rt rp),
 
       attributes: {
+        :all => %w(lang),
         'a' => %w(href rel class translate),
         'span' => %w(class translate),
         'ol' => %w(start reversed),