diff --git a/lib/src/global_packages.dart b/lib/src/global_packages.dart
index 16e2f1730..54f04d48a 100644
--- a/lib/src/global_packages.dart
+++ b/lib/src/global_packages.dart
@@ -13,6 +13,7 @@ import 'entrypoint.dart';
 import 'exceptions.dart';
 import 'executable.dart' as exec;
 import 'io.dart';
+import 'language_version.dart';
 import 'lock_file.dart';
 import 'log.dart' as log;
 import 'package.dart';
@@ -114,6 +115,7 @@ class GlobalPackages {
           if (ref != null) 'ref': ref,
         },
         containingDescription: RootDescription(p.current),
+        languageVersion: LanguageVersion.fromVersion(sdk.version),
       );
     } on FormatException catch (e) {
       throw ApplicationException(e.message);
diff --git a/lib/src/language_version.dart b/lib/src/language_version.dart
index 578744458..f7d2b9d3f 100644
--- a/lib/src/language_version.dart
+++ b/lib/src/language_version.dart
@@ -72,6 +72,9 @@ class LanguageVersion implements Comparable<LanguageVersion> {
 
   bool get supportsWorkspaces => this >= firstVersionWithWorkspaces;
 
+  bool get forbidsUnknownDescriptionKeys =>
+      this >= firstVersionForbidingUnknownDescriptionKeys;
+
   /// Minimum language version at which short hosted syntax is supported.
   ///
   /// This allows `hosted` dependencies to be expressed as:
@@ -109,6 +112,8 @@ class LanguageVersion implements Comparable<LanguageVersion> {
   static const firstVersionWithNullSafety = LanguageVersion(2, 12);
   static const firstVersionWithShorterHostedSyntax = LanguageVersion(2, 15);
   static const firstVersionWithWorkspaces = LanguageVersion(3, 5);
+  static const firstVersionForbidingUnknownDescriptionKeys =
+      LanguageVersion(3, 7);
 
   /// Transform language version to string that can be parsed with
   /// [LanguageVersion.parse].
diff --git a/lib/src/source/git.dart b/lib/src/source/git.dart
index 54f4dd2e1..2c753c653 100644
--- a/lib/src/source/git.dart
+++ b/lib/src/source/git.dart
@@ -38,7 +38,7 @@ class GitSource extends CachedSource {
     String name,
     Object? description, {
     Description? containingDescription,
-    LanguageVersion? languageVersion,
+    required LanguageVersion languageVersion,
   }) {
     String url;
     String? ref;
@@ -72,6 +72,16 @@ class GitSource extends CachedSource {
             'string.');
       }
       path = descriptionPath;
+
+      if (languageVersion.forbidsUnknownDescriptionKeys) {
+        for (final key in description.keys) {
+          if (!['url', 'ref', 'path'].contains(key)) {
+            throw FormatException(
+              'Unknown key "$key" in description.',
+            );
+          }
+        }
+      }
     }
 
     final containingDir = switch (containingDescription) {
diff --git a/lib/src/source/hosted.dart b/lib/src/source/hosted.dart
index c7d5a03b6..cb31c5931 100644
--- a/lib/src/source/hosted.dart
+++ b/lib/src/source/hosted.dart
@@ -381,6 +381,15 @@ class HostedSource extends CachedSource {
     }
     final url = u ?? defaultUrl;
 
+    if (languageVersion.forbidsUnknownDescriptionKeys) {
+      for (final key in description.keys) {
+        if (!['url', 'name'].contains(key)) {
+          throw FormatException(
+            'Unknown key "$key" in description.',
+          );
+        }
+      }
+    }
     return HostedDescription(name, url as String);
   }
 
diff --git a/test/pubspec_test.dart b/test/pubspec_test.dart
index c181fcc0c..f0f5a0f27 100644
--- a/test/pubspec_test.dart
+++ b/test/pubspec_test.dart
@@ -1133,5 +1133,39 @@ name: 'foo'
         );
       });
     });
+    test(
+        'Throws after language 3.7 '
+        'if using unknown keys in dependency description', () {
+      expectPubspecException(
+        '''
+environment:
+  sdk: 3.7.0
+dependencies:
+  foo:
+    hosted:
+      name: 'foo'
+      url: https://pub.dev/
+      someOtherProperty: 'smile'
+''',
+        (pubspec) => pubspec.dependencies,
+        expectedContains: 'Unknown key "someOtherProperty" in description.',
+      );
+
+      expectPubspecException(
+        '''
+environment:
+  sdk: 3.7.0
+dependencies:
+  test:
+    git:
+      ref: 'v1.0.0'
+      url: https://github.com/dart-lang/test
+      path: 'pkgs/test'
+      someOtherProperty: 'smile'
+''',
+        (pubspec) => pubspec.dependencies,
+        expectedContains: 'Unknown key "someOtherProperty" in description.',
+      );
+    });
   });
 }
diff --git a/test/unknown_properties_in_description_test.dart b/test/unknown_properties_in_description_test.dart
new file mode 100644
index 000000000..137e89e4e
--- /dev/null
+++ b/test/unknown_properties_in_description_test.dart
@@ -0,0 +1,104 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:pub/src/exit_codes.dart';
+import 'package:test/test.dart';
+
+import 'descriptor.dart' as d;
+import 'test_pub.dart';
+
+void main() {
+  test('Ignores additional properties in descriptions before 3.7', () async {
+    final server = await servePackages();
+    server.serve(
+      'foo',
+      '1.0.0',
+      sdk: '^3.6.0',
+      deps: {
+        'bar': {
+          'hosted': {'url': server.url, 'unknown': 11},
+        },
+      },
+    );
+    server.serve('bar', '1.0.0');
+    await d.appDir(
+      pubspec: {
+        'environment': {'sdk': '^3.6.0'},
+      },
+      dependencies: {
+        'foo': {
+          'hosted': {'url': server.url, 'unknown': 11},
+          'version': '^1.0.0',
+        },
+      },
+    ).create();
+    await pubGet(environment: {'_PUB_TEST_SDK_VERSION': '3.7.0'});
+  });
+
+  test('Detects unknown attributes in descriptions in root project after 3.7',
+      () async {
+    final server = await servePackages();
+    server.serve(
+      'foo',
+      '1.0.0',
+      sdk: '^3.6.0',
+      deps: {
+        'bar': {
+          'hosted': {'url': server.url, 'unknown': 11},
+        },
+      },
+    );
+    server.serve('bar', '1.0.0');
+    await d.appDir(
+      pubspec: {
+        'environment': {'sdk': '^3.7.0'},
+      },
+      dependencies: {
+        'foo': {
+          'hosted': {'url': server.url, 'unknown': 11},
+          'version': '^1.0.0',
+        },
+      },
+    ).create();
+    await pubGet(
+      environment: {'_PUB_TEST_SDK_VERSION': '3.7.0'},
+      error: contains('Invalid description in the "myapp" pubspec '
+          'on the "foo" dependency: Unknown key "unknown" in description.'),
+      exitCode: DATA,
+    );
+  });
+
+  test('Detects unknown attributes in descriptions in dependency after 3.7',
+      () async {
+    final server = await servePackages();
+    server.serve(
+      'foo',
+      '1.0.0',
+      sdk: '^3.7.0',
+      deps: {
+        'bar': {
+          'hosted': {'url': server.url, 'unknown': 11},
+        },
+      },
+    );
+    server.serve('bar', '1.0.0');
+    await d.appDir(
+      pubspec: {
+        'environment': {'sdk': '^3.6.0'},
+      },
+      dependencies: {
+        'foo': {
+          'hosted': {'url': server.url, 'unknown': 11},
+          'version': '^1.0.0',
+        },
+      },
+    ).create();
+    await pubGet(
+      environment: {'_PUB_TEST_SDK_VERSION': '3.7.0'},
+      error: contains('Invalid description in the "foo" pubspec '
+          'on the "bar" dependency: Unknown key "unknown" in description.'),
+      exitCode: DATA,
+    );
+  });
+}