diff --git a/lib/modules/manager/dockerfile/extract.spec.ts b/lib/modules/manager/dockerfile/extract.spec.ts
index 5ea952477dae83..b7934f840b663e 100644
--- a/lib/modules/manager/dockerfile/extract.spec.ts
+++ b/lib/modules/manager/dockerfile/extract.spec.ts
@@ -330,6 +330,26 @@ describe('modules/manager/dockerfile/extract', () => {
       ]);
     });
 
+    it('extracts tags from Dockerfile which begins with a BOM marker', () => {
+      const res = extractPackageFile(
+        '\uFEFFFROM node:6.12.3 as frontend\n\n',
+        '',
+        {},
+      )?.deps;
+      expect(res).toEqual([
+        {
+          autoReplaceStringTemplate:
+            '{{depName}}{{#if newValue}}:{{newValue}}{{/if}}{{#if newDigest}}@{{newDigest}}{{/if}}',
+          currentDigest: undefined,
+          currentValue: '6.12.3',
+          datasource: 'docker',
+          depName: 'node',
+          depType: 'final',
+          replaceString: 'node:6.12.3',
+        },
+      ]);
+    });
+
     it('skips scratches', () => {
       const res = extractPackageFile('FROM scratch\nADD foo\n', '', {});
       expect(res).toBeNull();
diff --git a/lib/modules/manager/dockerfile/extract.ts b/lib/modules/manager/dockerfile/extract.ts
index 81e2da71bf4327..53dd5550248558 100644
--- a/lib/modules/manager/dockerfile/extract.ts
+++ b/lib/modules/manager/dockerfile/extract.ts
@@ -244,6 +244,7 @@ export function extractPackageFile(
   _packageFile: string,
   config: ExtractConfig,
 ): PackageFileContent | null {
+  const sanitizedContent = content.replace(regEx(/^\uFEFF/), ''); // remove bom marker
   const deps: PackageDependency[] = [];
   const stageNames: string[] = [];
   const args: Record<string, string> = {};
@@ -253,8 +254,8 @@ export function extractPackageFile(
   let lookForEscapeChar = true;
   let lookForSyntaxDirective = true;
 
-  const lineFeed = content.indexOf('\r\n') >= 0 ? '\r\n' : '\n';
-  const lines = content.split(newlineRegex);
+  const lineFeed = sanitizedContent.indexOf('\r\n') >= 0 ? '\r\n' : '\n';
+  const lines = sanitizedContent.split(newlineRegex);
   for (let lineNumber = 0; lineNumber < lines.length; ) {
     const lineNumberInstrStart = lineNumber;
     let instruction = lines[lineNumber];