diff --git a/CHANGELOG.md b/CHANGELOG.md
index 375288258a2d..36966fdfd681 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Discard candidates with an empty data type ([#19172](https://github.com/tailwindlabs/tailwindcss/pull/19172))
+- Fix canonicalization of arbitrary variants with attribute selectors ([#19176](https://github.com/tailwindlabs/tailwindcss/pull/19176))
 
 ## [4.1.15] - 2025-10-20
 
diff --git a/packages/tailwindcss/src/canonicalize-candidates.test.ts b/packages/tailwindcss/src/canonicalize-candidates.test.ts
index 1e76a7b7cfa4..bcf992a886ea 100644
--- a/packages/tailwindcss/src/canonicalize-candidates.test.ts
+++ b/packages/tailwindcss/src/canonicalize-candidates.test.ts
@@ -846,6 +846,10 @@ describe.each([['default'], ['with-variant'], ['important'], ['prefix']])('%s',
       ['[&_>_[data-visible]]:flex', '*:data-visible:flex'],
       ['[&>*]:flex', '*:flex'],
       ['[&_>_*]:flex', '*:flex'],
+      ['[&_>_[foo]]:flex', '*:[[foo]]:flex'],
+      ['[&_[foo]]:flex', '**:[[foo]]:flex'],
+      ['[&_>_[foo=bar]]:flex', '*:[[foo=bar]]:flex'],
+      ['[&_[foo=bar]]:flex', '**:[[foo=bar]]:flex'],
 
       ['[&_[data-visible]]:flex', '**:data-visible:flex'],
       ['[&_*]:flex', '**:flex'],
diff --git a/packages/tailwindcss/src/canonicalize-candidates.ts b/packages/tailwindcss/src/canonicalize-candidates.ts
index 996859c539cd..fd8b862490cf 100644
--- a/packages/tailwindcss/src/canonicalize-candidates.ts
+++ b/packages/tailwindcss/src/canonicalize-candidates.ts
@@ -1649,8 +1649,9 @@ function modernizeArbitraryValuesVariant(
           !isSingleSelector(target.nodes) ||
           // [foo][bar] is considered a single selector but has multiple nodes
           target.nodes.length !== 1
-        )
+        ) {
           continue
+        }
 
         // Expecting a single attribute selector
         if (!isAttributeSelector(target.nodes[0])) continue
@@ -1796,6 +1797,15 @@ function modernizeArbitraryValuesVariant(
                     }, // aria-[foo~="true"], aria-[foo|="true"], …
           } satisfies Variant)
         }
+
+        // Arbitrary attributes
+        else {
+          replaceObject(variant, {
+            kind: 'arbitrary',
+            selector: target.value,
+            relative: false,
+          } satisfies Variant)
+        }
       }
 
       if (prefixedVariant) {