diff --git a/src/bun.js/webcore/blob/read_file.zig b/src/bun.js/webcore/blob/read_file.zig
index db36497de4a..52705c7f3c1 100644
--- a/src/bun.js/webcore/blob/read_file.zig
+++ b/src/bun.js/webcore/blob/read_file.zig
@@ -384,8 +384,9 @@ pub const ReadFile = struct {
 
         // add an extra 16 bytes to the buffer to avoid having to resize it for trailing extra data
         if (!this.could_block or (this.size > 0 and this.size != Blob.max_size))
-            this.buffer = std.ArrayListUnmanaged(u8).initCapacity(bun.default_allocator, this.size + 16) catch |err| {
+            this.buffer = std.ArrayListUnmanaged(u8).initCapacity(bun.default_allocator, @as(usize, this.size) + 16) catch |err| {
                 this.errno = err;
+                this.system_error = bun.sys.Error.fromCode(bun.sys.E.NOMEM, .read).toSystemError();
                 this.onFinish();
                 return;
             };
diff --git a/test/js/web/fetch/blob-oom.test.ts b/test/js/web/fetch/blob-oom.test.ts
index dc7dd16bc09..e9d40914ae6 100644
--- a/test/js/web/fetch/blob-oom.test.ts
+++ b/test/js/web/fetch/blob-oom.test.ts
@@ -1,7 +1,7 @@
 import { setSyntheticAllocationLimitForTesting } from "bun:internal-for-testing";
 import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, test } from "bun:test";
 import { unlinkSync } from "fs";
-import { tempDirWithFiles } from "harness";
+import { isWindows, tempDirWithFiles } from "harness";
 import path from "path";
 describe("Memory", () => {
   beforeAll(() => {
@@ -142,3 +142,19 @@ describe("Bun.file", () => {
     expect(async () => await Bun.file(tmpFile).arrayBuffer()).not.toThrow();
   });
 });
+
+describe.if(!isWindows)("Bun.file on character devices", () => {
+  test("slice() with a very large max length throws OOM without crashing", async () => {
+    // Regression test: reading a character device (e.g. /dev/null) with a
+    // max_length close to u52 max used to overflow `this.size + 16` in
+    // ReadFile.runAsyncWithFD and panic in debug builds. Also verifies that
+    // OOM from the buffer allocation is propagated to JS rather than
+    // silently returning an empty result.
+    expect(
+      async () =>
+        await Bun.file("/dev/null")
+          .slice(0, 2 ** 52 - 15)
+          .bytes(),
+    ).toThrow();
+  });
+});