diff --git a/README.md b/README.md
index 3a3dde97..355a3f08 100644
--- a/README.md
+++ b/README.md
@@ -115,8 +115,8 @@ USAGE
   $ hd scan eol [--json] [-f <value> | -d <value>] [-s] [--saveSbom] [--saveTrimmedSbom] [--hideReportUrl] [--version]
 
 FLAGS
-  -d, --dir=<value>      [default: <current directory>] The directory to scan in order to create a cyclonedx SBOM
-  -f, --file=<value>     The file path of an existing cyclonedx SBOM to scan for EOL
+  -d, --dir=<value>      [default: <current directory>] The directory to scan in order to scan for EOL
+  -f, --file=<value>     The file path of an existing SBOM to scan for EOL (supports CycloneDX and SPDX 2.3 formats)
   -s, --save             Save the generated report as herodevs.report.json in the scanned directory
       --hideReportUrl    Hide the generated web report URL for this scan
       --saveSbom         Save the generated SBOM as herodevs.sbom.json in the scanned directory
diff --git a/e2e/fixtures/npm/simple-spdx.sbom.json b/e2e/fixtures/npm/simple-spdx.sbom.json
new file mode 100644
index 00000000..501b3031
--- /dev/null
+++ b/e2e/fixtures/npm/simple-spdx.sbom.json
@@ -0,0 +1,37 @@
+{
+  "spdxVersion": "SPDX-2.3",
+  "dataLicense": "CC0-1.0",
+  "SPDXID": "SPDXRef-DOCUMENT",
+  "name": "simple-npm-project",
+  "documentNamespace": "https://example.com/simple-npm-project",
+  "creationInfo": {
+    "created": "2024-01-01T00:00:00Z",
+    "creators": ["Tool: test"]
+  },
+  "packages": [
+    {
+      "SPDXID": "SPDXRef-Package-bootstrap-3.1.1",
+      "name": "bootstrap",
+      "versionInfo": "3.1.1",
+      "externalRefs": [
+        {
+          "referenceCategory": "PACKAGE-MANAGER",
+          "referenceType": "purl",
+          "referenceLocator": "pkg:npm/bootstrap@3.1.1"
+        }
+      ]
+    },
+    {
+      "SPDXID": "SPDXRef-Package-vue-3.5.13",
+      "name": "vue",
+      "versionInfo": "3.5.13",
+      "externalRefs": [
+        {
+          "referenceCategory": "PACKAGE-MANAGER",
+          "referenceType": "purl",
+          "referenceLocator": "pkg:npm/vue@3.5.13"
+        }
+      ]
+    }
+  ]
+}
diff --git a/e2e/scan/eol.test.ts b/e2e/scan/eol.test.ts
index 4fea3eed..6596004a 100644
--- a/e2e/scan/eol.test.ts
+++ b/e2e/scan/eol.test.ts
@@ -16,6 +16,7 @@ const execAsync = promisify(exec);
 const fixturesDir = path.resolve(import.meta.dirname, '../fixtures');
 const simpleDir = path.resolve(fixturesDir, 'npm/simple');
 const simpleSbom = path.join(simpleDir, 'sbom.json');
+const simpleSpdxSbom = path.join(fixturesDir, 'npm/simple-spdx.sbom.json');
 const upToDateDir = path.resolve(fixturesDir, 'npm/up-to-date');
 const upToDateSbom = path.join(fixturesDir, 'npm/up-to-date.sbom.json');
 const noComponentsSbom = path.join(fixturesDir, 'npm/no-components.sbom.json');
@@ -135,6 +136,14 @@ describe('scan:eol e2e', () => {
     match(stdout, /2 total packages scanned/, 'Should show total packages scanned');
   });
 
+  it('scans existing SPDX SBOM file and converts to CycloneDX', async () => {
+    const cmd = `scan:eol --file ${simpleSpdxSbom}`;
+    const { stdout } = await run(cmd);
+    match(stdout, /Scan results:/, 'Should show results header');
+    match(stdout, /1( .*)End-of-Life \(EOL\)/, 'Should show EOL count');
+    match(stdout, /2 total packages scanned/, 'Should show total packages scanned with SPDX input');
+  });
+
   it('shows warning and does not generate report when no components are found in scan', async () => {
     const cmd = `scan:eol --file ${noComponentsSbom}`;
     const { stdout } = await run(cmd);
@@ -406,8 +415,8 @@ describe('scan:eol e2e', () => {
       return output;
     }
 
-    function expectAny(output: { stdout: string; stderr: string }, patterns: RegExp[], message: string) {
-      const text = `${output.stderr}\n${output.stdout}`;
+    function expectAny(output: { stdout: string; stderr: string; error?: Error }, patterns: RegExp[], message: string) {
+      const text = `${output.stderr}\n${output.stdout}\n${output.error?.message || ''}`;
       const matched = patterns.some((re) => re.test(text));
       strictEqual(matched, true, message);
     }
@@ -437,6 +446,21 @@ describe('scan:eol e2e', () => {
       }
     });
 
+    it('fails when SBOM file is neither SPDX nor CycloneDX format', async () => {
+      const badFile = path.join(fixturesDir, 'npm', 'invalid-format.json');
+      writeFileSync(badFile, JSON.stringify({ invalid: 'format', notSpdx: true, notCdx: true }));
+      try {
+        const out = await runExpectFail(`scan:eol --file ${badFile}`);
+        expectAny(
+          out,
+          [/Failed to read SBOM file/i, /Invalid SBOM file format/i, /Expected SPDX 2\.3 or CycloneDX format./i],
+          'Should indicate invalid SBOM format',
+        );
+      } finally {
+        unlinkSync(badFile);
+      }
+    });
+
     it('fails when directory does not exist', async () => {
       const missingDir = path.join(fixturesDir, 'npm', 'no-such-dir');
       const out = await runExpectFail(`scan:eol --dir ${missingDir}`);
diff --git a/src/commands/scan/eol.ts b/src/commands/scan/eol.ts
index 05cde001..03b3b656 100644
--- a/src/commands/scan/eol.ts
+++ b/src/commands/scan/eol.ts
@@ -44,7 +44,7 @@ export default class ScanEol extends Command {
   static override flags = {
     file: Flags.string({
       char: 'f',
-      description: 'The file path of an existing cyclonedx SBOM to scan for EOL',
+      description: 'The file path of an existing SBOM to scan for EOL (supports CycloneDX and SPDX 2.3 formats)',
       exclusive: ['dir'],
     }),
     dir: Flags.string({
diff --git a/src/service/file.svc.ts b/src/service/file.svc.ts
index dcd3ffe8..a257a5c3 100644
--- a/src/service/file.svc.ts
+++ b/src/service/file.svc.ts
@@ -1,7 +1,7 @@
 import fs from 'node:fs';
 import path, { join, resolve } from 'node:path';
-import type { CdxBom, EolReport } from '@herodevs/eol-shared';
-import { isCdxBom } from '@herodevs/eol-shared';
+import type { CdxBom, EolReport, SPDX23 } from '@herodevs/eol-shared';
+import { isCdxBom, isSpdxBom, spdxToCdxBom } from '@herodevs/eol-shared';
 import { filenamePrefix } from '../config/constants.ts';
 import { getErrorMessage } from './log.svc.ts';
 
@@ -10,7 +10,8 @@ export interface FileError extends Error {
 }
 
 /**
- * Reads an SBOM from a file path
+ * Reads an SBOM from a file path and converts it to CycloneDX format
+ * Supports both SPDX 2.3 and CycloneDX formats
  */
 export function readSbomFromFile(filePath: string): CdxBom {
   const file = resolve(filePath);
@@ -21,11 +22,17 @@ export function readSbomFromFile(filePath: string): CdxBom {
 
   try {
     const fileContent = fs.readFileSync(file, 'utf8');
-    const sbom = JSON.parse(fileContent) as CdxBom;
-    if (!isCdxBom(sbom)) {
-      throw new Error(`Invalid SBOM file: ${file}`);
+    const jsonContent = JSON.parse(fileContent);
+
+    if (isSpdxBom(jsonContent)) {
+      return spdxToCdxBom(jsonContent as SPDX23);
+    }
+
+    if (isCdxBom(jsonContent)) {
+      return jsonContent as CdxBom;
     }
-    return sbom;
+
+    throw new Error(`Invalid SBOM file format. Expected SPDX 2.3 or CycloneDX format.`);
   } catch (error) {
     throw new Error(`Failed to read SBOM file: ${getErrorMessage(error)}`);
   }
diff --git a/test/service/file.svc.test.ts b/test/service/file.svc.test.ts
index 24f3e6f5..5dcdbf51 100644
--- a/test/service/file.svc.test.ts
+++ b/test/service/file.svc.test.ts
@@ -4,7 +4,7 @@ import { mkdtemp, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { after, describe, it } from 'node:test';
-import type { CdxBom, EolReport } from '@herodevs/eol-shared';
+import type { CdxBom, EolReport, SPDX23 } from '@herodevs/eol-shared';
 import {
   readSbomFromFile,
   saveReportToFile,
@@ -23,6 +23,19 @@ describe('file.svc', () => {
     components: [],
   } as unknown as CdxBom;
 
+  const mockSpdxSbom: SPDX23 = {
+    spdxVersion: 'SPDX-2.3',
+    dataLicense: 'CC0-1.0',
+    SPDXID: 'SPDXRef-DOCUMENT',
+    name: 'test-sbom',
+    documentNamespace: 'https://example.com/test',
+    creationInfo: {
+      created: '2024-01-01T00:00:00Z',
+      creators: ['Tool: test'],
+    },
+    packages: [],
+  };
+
   const mockReport: EolReport = {
     id: 'test-id',
     createdOn: new Date().toISOString(),
@@ -40,7 +53,7 @@ describe('file.svc', () => {
   });
 
   describe('readSbomFromFile', () => {
-    it('should read and parse a valid SBOM file', async () => {
+    it('should read and parse a valid CycloneDX SBOM file', async () => {
       tempDir = await mkdtemp(join(tmpdir(), 'file-svc-test-'));
       const filePath = join(tempDir, 'test.json');
       await writeFile(filePath, JSON.stringify(mockSbom));
@@ -49,6 +62,18 @@ describe('file.svc', () => {
       assert.deepStrictEqual(result, mockSbom);
     });
 
+    it('should read and convert a valid SPDX SBOM file to CycloneDX', async () => {
+      tempDir = await mkdtemp(join(tmpdir(), 'file-svc-test-'));
+      const filePath = join(tempDir, 'spdx-test.json');
+      await writeFile(filePath, JSON.stringify(mockSpdxSbom));
+
+      const result = readSbomFromFile(filePath);
+
+      assert.strictEqual(result.bomFormat, 'CycloneDX');
+      assert.ok(result.specVersion);
+      assert.ok(Array.isArray(result.components));
+    });
+
     it('should throw error for non-existent file', () => {
       assert.throws(() => readSbomFromFile('/non/existent/path'), /SBOM file not found/);
     });
@@ -60,6 +85,17 @@ describe('file.svc', () => {
 
       assert.throws(() => readSbomFromFile(filePath), /Failed to read SBOM file/);
     });
+
+    it('should throw error for invalid SBOM format (neither SPDX nor CycloneDX)', async () => {
+      tempDir = await mkdtemp(join(tmpdir(), 'file-svc-test-'));
+      const filePath = join(tempDir, 'invalid-format.json');
+      await writeFile(filePath, JSON.stringify({ invalid: 'format' }));
+
+      assert.throws(
+        () => readSbomFromFile(filePath),
+        /Invalid SBOM file format\. Expected SPDX 2\.3 or CycloneDX format/,
+      );
+    });
   });
 
   describe('validateDirectory', () => {