diff --git a/packages/vector_graphics_compiler/CHANGELOG.md b/packages/vector_graphics_compiler/CHANGELOG.md
index b43c464030a..738b0afd563 100644
--- a/packages/vector_graphics_compiler/CHANGELOG.md
+++ b/packages/vector_graphics_compiler/CHANGELOG.md
@@ -1,5 +1,6 @@
-## NEXT
+## 1.1.20
 
+* Fixes color parsing for modern rgb and rgba CSS syntax.
 * Updates minimum supported SDK version to Flutter 3.35/Dart 3.9.
 
 ## 1.1.19
diff --git a/packages/vector_graphics_compiler/lib/src/svg/colors.dart b/packages/vector_graphics_compiler/lib/src/svg/colors.dart
index 718cd42b184..5d9b3e6ad66 100644
--- a/packages/vector_graphics_compiler/lib/src/svg/colors.dart
+++ b/packages/vector_graphics_compiler/lib/src/svg/colors.dart
@@ -157,3 +157,145 @@ const Map<String, Color> namedColors = <String, Color>{
   'yellow': Color.fromARGB(255, 255, 255, 0),
   'yellowgreen': Color.fromARGB(255, 154, 205, 50),
 };
+
+/// Parses a CSS `rgb()` or `rgba()` function color string and returns a Color.
+///
+/// The [colorString] should be the full color string including the function
+/// name (`rgb` or `rgba`) and parentheses.
+///
+/// Both `rgb()` and `rgba()` accept the same syntax variations:
+/// - `rgb(R G B)` or `rgba(R G B)` - modern space-separated
+/// - `rgb(R G B / A)` or `rgba(R G B / A)` - modern with slash before alpha
+/// - `rgb(R,G,B)` or `rgba(R,G,B)` - legacy comma-separated
+/// - `rgb(R,G,B,A)` or `rgba(R,G,B,A)` - legacy with alpha
+///
+/// Throws [ArgumentError] if the color string is invalid.
+Color parseRgbFunction(String colorString) {
+  final String content = colorString.substring(
+    colorString.indexOf('(') + 1,
+    colorString.indexOf(')'),
+  );
+
+  if (content.isEmpty) {
+    throw ArgumentError.value(colorString, 'colorString', 'Empty content');
+  }
+  final List<String> stringRgbValues;
+  final String? stringAlphaValue;
+
+  final List<String> commaSplit = content
+      .split(',')
+      .map((String value) => value.trim())
+      .toList();
+
+  if (commaSplit.length > 1) {
+    // We are dealing with comma-separated syntax
+    (stringAlphaValue, stringRgbValues) = switch (commaSplit.length) {
+      3 => (null, commaSplit),
+      4 => (commaSplit.removeLast(), commaSplit),
+      _ => throw ArgumentError.value(
+        colorString,
+        'colorString',
+        'Expected 3 or 4 values, got ${commaSplit.length}',
+      ),
+    };
+  } else {
+    final List<String> slashSplit = content
+        .split('/')
+        .map((String value) => value.trim())
+        .toList();
+
+    final (
+      String tempStringRgbValues,
+      String? tempStringAlphaValue,
+    ) = switch (slashSplit.length) {
+      1 => (slashSplit.first, null),
+      2 => (slashSplit.first, slashSplit.last),
+      _ => throw ArgumentError.value(
+        colorString,
+        'colorString',
+        'Multiple slashes not allowed',
+      ),
+    };
+
+    final List<String> rgbSpaceSplit = tempStringRgbValues
+        .split(' ')
+        .map((String value) => value.trim())
+        .where((String value) => value.isNotEmpty)
+        .toList();
+
+    if (rgbSpaceSplit.length != 3) {
+      throw ArgumentError.value(
+        colorString,
+        'colorString',
+        'Expected 3 space-separated RGB values',
+      );
+    }
+
+    stringRgbValues = rgbSpaceSplit;
+    stringAlphaValue = tempStringAlphaValue;
+  }
+
+  final List<int> rgbIntValues = stringRgbValues
+      .map(
+        (String value) => _parseRgbaFunctionComponent(
+          isAlpha: false,
+          rawComponentValue: value,
+          originalColorString: colorString,
+        ),
+      )
+      .toList();
+
+  final int a = stringAlphaValue == null
+      ? 255
+      : _parseRgbaFunctionComponent(
+          isAlpha: true,
+          rawComponentValue: stringAlphaValue,
+          originalColorString: colorString,
+        );
+
+  return Color.fromARGB(a, rgbIntValues[0], rgbIntValues[1], rgbIntValues[2]);
+}
+
+/// Parses a single RGB/RGBA component value and returns an integer 0-255.
+///
+/// The [rawComponentValue] can be:
+/// - A percentage (e.g., "50%") - converted to 0-255 range
+/// - A decimal number (e.g., "128" or "128.5") - clamped to 0-255 for RGB
+/// - For alpha (index 3): decimal 0-1 range, converted to 0-255
+///
+/// Out-of-bounds values are clamped rather than rejected.
+///
+/// Throws [ArgumentError] if the value cannot be parsed as a number.
+int _parseRgbaFunctionComponent({
+  required bool isAlpha,
+  required String rawComponentValue,
+  required String originalColorString,
+}) {
+  if (rawComponentValue.endsWith('%')) {
+    final String numPart = rawComponentValue.substring(
+      0,
+      rawComponentValue.length - 1,
+    );
+    final double? percent = double.tryParse(numPart);
+    if (percent == null) {
+      throw ArgumentError.value(
+        originalColorString,
+        'originalColorString',
+        'invalid percentage "$rawComponentValue"',
+      );
+    }
+    return (percent.clamp(0, 100) * 2.55).round();
+  }
+  final double? value = double.tryParse(rawComponentValue);
+  if (value == null) {
+    throw ArgumentError.value(
+      originalColorString,
+      'originalColorString',
+      'invalid value "$rawComponentValue"',
+    );
+  }
+  if (isAlpha) {
+    return (value.clamp(0, 1) * 255).round();
+  }
+  return value.clamp(0, 255).round();
+}
diff --git a/packages/vector_graphics_compiler/lib/src/svg/parser.dart b/packages/vector_graphics_compiler/lib/src/svg/parser.dart
index b8f67adc89c..a9746f76a54 100644
--- a/packages/vector_graphics_compiler/lib/src/svg/parser.dart
+++ b/packages/vector_graphics_compiler/lib/src/svg/parser.dart
@@ -1372,21 +1372,10 @@ class SvgParser {
       }
     }
 
-    // handle rgba() colors e.g. rgba(255, 255, 255, 1.0)
-    if (colorString.toLowerCase().startsWith('rgba')) {
-      final List<String> rawColorElements = colorString
-          .substring(colorString.indexOf('(') + 1, colorString.indexOf(')'))
-          .split(',')
-          .map((String rawColor) => rawColor.trim())
-          .toList();
-
-      final double opacity = parseDouble(rawColorElements.removeLast())!;
-
-      final List<int> rgb = rawColorElements
-          .map((String rawColor) => int.parse(rawColor))
-          .toList();
-
-      return Color.fromRGBO(rgb[0], rgb[1], rgb[2], opacity);
+    // handle rgba() colors e.g. rgb(255, 255, 255) and rgba(255, 255, 255, 1.0)
+    // https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/color_value/rgb
+    if (colorString.toLowerCase().startsWith('rgb')) {
+      return parseRgbFunction(colorString);
     }
 
     // Conversion code from: https://github.com/MichaelFenwick/Color, thanks :)
@@ -1456,26 +1445,6 @@ class SvgParser {
       );
     }
 
-    // handle rgb() colors e.g. rgb(255, 255, 255)
-    if (colorString.toLowerCase().startsWith('rgb')) {
-      final List<int> rgb = colorString
-          .substring(colorString.indexOf('(') + 1, colorString.indexOf(')'))
-          .split(',')
-          .map((String rawColor) {
-            rawColor = rawColor.trim();
-            if (rawColor.endsWith('%')) {
-              rawColor = rawColor.substring(0, rawColor.length - 1);
-              return (parseDouble(rawColor)! * 2.55).round();
-            }
-            return int.parse(rawColor);
-          })
-          .toList();
-
-      // rgba() isn't really in the spec, but Firefox supported it at one point so why not.
-      final int a = rgb.length > 3 ? rgb[3] : 255;
-      return Color.fromARGB(a, rgb[0], rgb[1], rgb[2]);
-    }
-
     // handle named colors ('red', 'green', etc.).
     final Color? namedColor = namedColors[colorString];
     if (namedColor != null) {
diff --git a/packages/vector_graphics_compiler/pubspec.yaml b/packages/vector_graphics_compiler/pubspec.yaml
index 3e6911fc9a3..43d627e60eb 100644
--- a/packages/vector_graphics_compiler/pubspec.yaml
+++ b/packages/vector_graphics_compiler/pubspec.yaml
@@ -2,7 +2,7 @@ name: vector_graphics_compiler
 description: A compiler to convert SVGs to the binary format used by `package:vector_graphics`.
 repository: https://github.com/flutter/packages/tree/main/packages/vector_graphics_compiler
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+vector_graphics%22
-version: 1.1.19
+version: 1.1.20
 
 executables:
   vector_graphics_compiler:
diff --git a/packages/vector_graphics_compiler/test/parsers_test.dart b/packages/vector_graphics_compiler/test/parsers_test.dart
index 6062682368a..1750ae4dd72 100644
--- a/packages/vector_graphics_compiler/test/parsers_test.dart
+++ b/packages/vector_graphics_compiler/test/parsers_test.dart
@@ -21,11 +21,202 @@ void main() {
       parser.parseColor('#ABCDEF', attributeName: 'foo', id: null),
       const Color.fromARGB(255, 0xAB, 0xCD, 0xEF),
     );
-    // RGBA in svg/css, ARGB in this library.
-    expect(
-      parser.parseColor('#ABCDEF88', attributeName: 'foo', id: null),
-      const Color.fromARGB(0x88, 0xAB, 0xCD, 0xEF),
-    );
+  });
+
+  group('Colors - svg/css', () {
+    final parser = SvgParser('', const SvgTheme(), 'test_key', true, null);
+
+    group('with no opacity', () {
+      const rgbContentVariations = [
+        // Legacy syntax (comma-separated)
+        '171, 205, 239',
+        '171,205,239',
+        // Modern syntax (space-separated)
+        '171 205 239',
+        // Percentage values
+        '67% 80.5% 93.7%',
+        // Mixed percentage and decimal (space-separated)
+        '67% 205 93.7%',
+        // Decimal RGB values
+        '171.1 205.1 238.9',
+      ];
+
+      final List<String> rgbaVariations = [
+        '#ABCDEF',
+        ...rgbContentVariations.map((rgb) => 'rgba($rgb)'),
+        ...rgbContentVariations.map((rgb) => 'rgb($rgb)'),
+      ];
+
+      for (final rgba in rgbaVariations) {
+        test(rgba, () {
+          expect(
+            parser.parseColor(rgba, attributeName: 'foo', id: null),
+            const Color.fromARGB(0xFF, 0xAB, 0xCD, 0xEF),
+          );
+        });
+      }
+    });
+
+    group('with opacity', () {
+      const rgbContentVariations = [
+        // Legacy syntax (comma-separated)
+        '171, 205, 239, 0.53',
+        '171,205,239,0.53',
+        // Modern syntax (space-separated with slash before alpha)
+        '171 205 239 / 53%',
+        '171 205 239 /  0.53',
+        '171 205 239 /  .53', // leading dot
+        '171 205 239 / 0.53',
+        // Percentage RGB with slash alpha
+        '67% 80.5% 93.7% / 53%',
+        // Mixed percentage and decimal RGB (space-separated) with slash alpha
+        '67% 205 93.7% / 53%',
+        // Decimal RGB values with percentage alpha
+        '171.1 205.1 238.9 / 53%',
+        // Decimal RGB values with decimal alpha
+        '171.1 205.1 238.9 / 0.53',
+      ];
+
+      final List<String> rgbaVariations = [
+        '#ABCDEF87',
+        ...rgbContentVariations.map((rgb) => 'rgba($rgb)'),
+        ...rgbContentVariations.map((rgb) => 'rgb($rgb)'),
+      ];
+
+      for (final rgba in rgbaVariations) {
+        test(rgba, () {
+          expect(
+            parser.parseColor(rgba, attributeName: 'foo', id: null),
+            const Color.fromARGB(0x87, 0xAB, 0xCD, 0xEF),
+          );
+        });
+      }
+    });
+
+    group('with values out of bounds', () {
+      // RGB values > 255 clamp to 255, negative values clamp to 0
+      // Percentages > 100% clamp to 100%, negative percentages clamp to 0%
+      // Alpha values > 1 clamp to 1, negative alpha clamps to 0
+
+      test('rgb(256.9, 0, 256) clamps RGB to 255', () {
+        expect(
+          parser.parseColor(
+            'rgb(256.9, 0, 256)',
+            attributeName: 'foo',
+            id: null,
+          ),
+          const Color.fromARGB(255, 255, 0, 255),
+        );
+      });
+
+      test('rgb(-50, 300, -100) clamps negative to 0 and >255 to 255', () {
+        expect(
+          parser.parseColor(
+            'rgb(-50, 300, -100)',
+            attributeName: 'foo',
+            id: null,
+          ),
+          const Color.fromARGB(255, 0, 255, 0),
+        );
+      });
+
+      test('rgb(120%, -10%, 200%) clamps percentages', () {
+        expect(
+          parser.parseColor(
+            'rgb(120%, -10%, 200%)',
+            attributeName: 'foo',
+            id: null,
+          ),
+          const Color.fromARGB(255, 255, 0, 255),
+        );
+      });
+
+      test('rgb(255, 0, 255, -0.5) negative alpha clamps to 0', () {
+        expect(
+          parser.parseColor(
+            'rgb(255, 0, 255, -0.5)',
+            attributeName: 'foo',
+            id: null,
+          ),
+          const Color.fromARGB(0, 255, 0, 255),
+        );
+      });
+
+      test('rgb(128, 128, 128, 2.5) alpha > 1 clamps to 1', () {
+        expect(
+          parser.parseColor(
+            'rgb(128, 128, 128, 2.5)',
+            attributeName: 'foo',
+            id: null,
+          ),
+          const Color.fromARGB(255, 128, 128, 128),
+        );
+      });
+
+      test('rgb(999 -50 300 / 150%) clamps all values', () {
+        expect(
+          parser.parseColor(
+            'rgb(999 -50 300 / 150%)',
+            attributeName: 'foo',
+            id: null,
+          ),
+          const Color.fromARGB(255, 255, 0, 255),
+        );
+      });
+    });
+
+    group('invalid syntax', () {
+      const rgbContentVariations = [
+        // 4 space-separated values without slash (modern syntax requires slash before alpha)
+        '171.1 205.1 238.9 53%',
+        '255 255 255 0.5',
+        '255 122 127 80%',
+        // Mixed comma and slash separators (not allowed)
+        '171.1,205.1 238.9/53%',
+        '255, 255, 255 / 0.5',
+        // Space-separated values after comma (not allowed)
+        '171.1,205.1 238.9, 53%',
+        '129% ,09% 255%,5.5',
+        // Single comma with 4 values (legacy alpha needs 2+ commas)
+        '129% 09% 255%,5.5',
+        // Empty values (double comma, leading comma, trailing comma)
+        '67%,,93.7%, 53%',
+        '10,,10',
+        '50,90,,0',
+        '255, 128, 0,',
+        // Slash between RGB values (slash only allowed before alpha)
+        '255 / 255 / 255',
+        // Too few values
+        '255 255',
+        // Too many values
+        '255 255 255 128 64',
+        // Missing alpha after slash
+        '255 255 255 /',
+        // Mixed separators: spaces before first comma, then commas (no alpha)
+        //  Note: This actually parses correctly on css(web) but it's not valid as per the spec.
+        '171 205,239',
+        // Mixed separators: spaces before first comma, then commas (decimal alpha)
+        //  Note: This actually parses correctly on css(web) but it's not valid as per the spec.
+        '171 205,239, 0.53',
+        // Mixed separators: spaces before first comma, then commas (percentage alpha)
+        //  Note: This actually parses correctly on css(web) but it's not valid as per the spec.
+        '171   205,239, 53%',
+      ];
+
+      final List<String> rgbaVariations = [
+        ...rgbContentVariations.map((rgb) => 'rgba($rgb)'),
+        ...rgbContentVariations.map((rgb) => 'rgb($rgb)'),
+      ];
+
+      for (final rgba in rgbaVariations) {
+        test(rgba, () {
+          expect(
+            () => parser.parseColor(rgba, attributeName: 'foo', id: null),
+            throwsArgumentError,
+          );
+        });
+      }
+    });
   });
 
   test('Colors - mapped', () async {