diff --git a/crates/ruff_linter/src/noqa.rs b/crates/ruff_linter/src/noqa.rs
index c2392b0e6bf60..ec352191e6c73 100644
--- a/crates/ruff_linter/src/noqa.rs
+++ b/crates/ruff_linter/src/noqa.rs
@@ -1274,6 +1274,30 @@ mod tests {
         assert_lexed_ranges_match_slices(directive, source);
     }
 
+    #[test]
+    fn malformed_code_1() {
+        let source = "# noqa: F";
+        let directive = lex_inline_noqa(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
+    #[test]
+    fn malformed_code_2() {
+        let source = "# noqa: RUF001, F";
+        let directive = lex_inline_noqa(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
+    #[test]
+    fn malformed_code_3() {
+        let source = "# noqa: RUF001F";
+        let directive = lex_inline_noqa(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
     #[test]
     fn noqa_code() {
         let source = "# noqa: F401";
@@ -1530,6 +1554,30 @@ mod tests {
         assert_lexed_ranges_match_slices(exemption, source);
     }
 
+    #[test]
+    fn flake8_malformed_code_1() {
+        let source = "# flake8: noqa: F";
+        let directive = lex_file_exemption(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
+    #[test]
+    fn flake8_malformed_code_2() {
+        let source = "# flake8: noqa: RUF001, F";
+        let directive = lex_file_exemption(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
+    #[test]
+    fn flake8_malformed_code_3() {
+        let source = "# flake8: noqa: RUF001F";
+        let directive = lex_file_exemption(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
     #[test]
     fn ruff_exemption_all() {
         let source = "# ruff: noqa";
@@ -1562,6 +1610,30 @@ mod tests {
         assert_lexed_ranges_match_slices(exemption, source);
     }
 
+    #[test]
+    fn ruff_malformed_code_1() {
+        let source = "# ruff: noqa: F";
+        let directive = lex_file_exemption(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
+    #[test]
+    fn ruff_malformed_code_2() {
+        let source = "# ruff: noqa: RUF001, F";
+        let directive = lex_file_exemption(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
+    #[test]
+    fn ruff_malformed_code_3() {
+        let source = "# ruff: noqa: RUF001F";
+        let directive = lex_file_exemption(TextRange::up_to(source.text_len()), source);
+        assert_debug_snapshot!(directive);
+        assert_lexed_ranges_match_slices(directive, source);
+    }
+
     #[test]
     fn flake8_exemption_all_no_space() {
         let source = "#flake8:noqa";
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_1.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_1.snap
new file mode 100644
index 0000000000000..196dcb58f8968
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_1.snap
@@ -0,0 +1,7 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Err(
+    MissingCodes,
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_2.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_2.snap
new file mode 100644
index 0000000000000..915b3393f2831
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_2.snap
@@ -0,0 +1,22 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Ok(
+    Some(
+        NoqaLexerOutput {
+            warnings: [],
+            directive: Codes(
+                Codes {
+                    range: 0..22,
+                    codes: [
+                        Code {
+                            code: "RUF001",
+                            range: 16..22,
+                        },
+                    ],
+                },
+            ),
+        },
+    ),
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_3.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_3.snap
new file mode 100644
index 0000000000000..44d5fcaa2262c
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__flake8_malformed_code_3.snap
@@ -0,0 +1,7 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Err(
+    InvalidCodeSuffix,
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_1.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_1.snap
new file mode 100644
index 0000000000000..196dcb58f8968
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_1.snap
@@ -0,0 +1,7 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Err(
+    MissingCodes,
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_2.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_2.snap
new file mode 100644
index 0000000000000..e7a3632209800
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_2.snap
@@ -0,0 +1,22 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Ok(
+    Some(
+        NoqaLexerOutput {
+            warnings: [],
+            directive: Codes(
+                Codes {
+                    range: 0..14,
+                    codes: [
+                        Code {
+                            code: "RUF001",
+                            range: 8..14,
+                        },
+                    ],
+                },
+            ),
+        },
+    ),
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_3.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_3.snap
new file mode 100644
index 0000000000000..44d5fcaa2262c
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__malformed_code_3.snap
@@ -0,0 +1,7 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Err(
+    InvalidCodeSuffix,
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_1.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_1.snap
new file mode 100644
index 0000000000000..196dcb58f8968
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_1.snap
@@ -0,0 +1,7 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Err(
+    MissingCodes,
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_2.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_2.snap
new file mode 100644
index 0000000000000..c59da01dbcdba
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_2.snap
@@ -0,0 +1,22 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Ok(
+    Some(
+        NoqaLexerOutput {
+            warnings: [],
+            directive: Codes(
+                Codes {
+                    range: 0..20,
+                    codes: [
+                        Code {
+                            code: "RUF001",
+                            range: 14..20,
+                        },
+                    ],
+                },
+            ),
+        },
+    ),
+)
diff --git a/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_3.snap b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_3.snap
new file mode 100644
index 0000000000000..44d5fcaa2262c
--- /dev/null
+++ b/crates/ruff_linter/src/snapshots/ruff_linter__noqa__tests__ruff_malformed_code_3.snap
@@ -0,0 +1,7 @@
+---
+source: crates/ruff_linter/src/noqa.rs
+expression: directive
+---
+Err(
+    InvalidCodeSuffix,
+)