diff --git a/package-lock.json b/package-lock.json
index 33332d40e..e4d1c0a19 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "@modelcontextprotocol/server": "2.3.1",
         "@xterm/addon-serialize": "0.14.0",
         "@xterm/headless": "6.0.0",
-        "@zip.js/zip.js": "2.8.26",
+        "@zip.js/zip.js": "2.15.0",
         "canonicalize": "3.0.0",
         "cross-spawn": "7.0.6",
         "diff": "9.0.0",
@@ -3945,9 +3945,9 @@
       ]
     },
     "node_modules/@zip.js/zip.js": {
-      "version": "2.8.26",
-      "resolved": "https://registry.npmjs.org/@zip.js/zip.js/-/zip.js-2.8.26.tgz",
-      "integrity": "sha512-RQ4h9F6DOiHxpdocUDrOl6xBM+yOtz+LkUol47AVWcfebGBDpZ7w7Xvz9PS24JgXvLGiXXzSAfdCdVy1tPlaFA==",
+      "version": "2.15.0",
+      "resolved": "https://registry.npmjs.org/@zip.js/zip.js/-/zip.js-2.15.0.tgz",
+      "integrity": "sha512-hYAuHAaWjt0axbofaDL5XUlmrQPsBDcK3f45ApZuh6N+8UGVk26GoGdtGDvcvzahsHytTQ6DtBVXwG9IcCMjjQ==",
       "license": "BSD-3-Clause",
       "engines": {
         "bun": ">=0.7.0",
diff --git a/package.json b/package.json
index 9ae878e5a..4b2b72f45 100644
--- a/package.json
+++ b/package.json
@@ -208,7 +208,7 @@
     "@modelcontextprotocol/server": "2.3.1",
     "@xterm/addon-serialize": "0.14.0",
     "@xterm/headless": "6.0.0",
-    "@zip.js/zip.js": "2.8.26",
+    "@zip.js/zip.js": "2.15.0",
     "canonicalize": "3.0.0",
     "cross-spawn": "7.0.6",
     "diff": "9.0.0",
diff --git a/src/artifacts/ZipArtifactReader.ts b/src/artifacts/ZipArtifactReader.ts
index f71a3b35b..8dd4471bd 100644
--- a/src/artifacts/ZipArtifactReader.ts
+++ b/src/artifacts/ZipArtifactReader.ts
@@ -53,6 +53,9 @@ export class ZipArtifactReader implements ArtifactReader {
     this.#reader = new ZipReader(this.#source, {
       checkSignature: true,
       checkOverlappingEntry: true,
+      // REA applies its own provider-neutral path validation in scanReader and
+      // must preserve that typed failure instead of zip.js rejecting first.
+      filenameValidation: "tolerant",
     });
   }
 
diff --git a/tests/boundary/filesystem/artifactZipIntegrity.test.ts b/tests/boundary/filesystem/artifactZipIntegrity.test.ts
new file mode 100644
index 000000000..10b221819
--- /dev/null
+++ b/tests/boundary/filesystem/artifactZipIntegrity.test.ts
@@ -0,0 +1,113 @@
+import { readFile, writeFile } from "node:fs/promises";
+import { join } from "node:path";
+
+import { TextReader, Uint8ArrayWriter, ZipWriter } from "@zip.js/zip.js";
+import { expect, it } from "vitest";
+
+import { writeOrderedZip } from "../../fixtures/artifactEntryOrder.js";
+import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
+
+import { parseBinaryTarget } from "../../../src/application/BinaryTargetResolver.js";
+import { ArtifactProvider } from "../../../src/artifacts/ArtifactProvider.js";
+import { artifactInventoryResultSchema } from "../../../src/domain/artifactGraph.js";
+
+it("rejects overlapping ZIP member data ranges through artifact inventory", async () => {
+  const root = await createTestTempDirectory("rea-zip-overlap-");
+  const path = join(root, "overlap.zip");
+  await writeOrderedZip(path, ["a.txt", "b.txt"]);
+  const bytes = await readFile(path);
+  const centralDirectorySignature = Buffer.from([0x50, 0x4b, 0x01, 0x02]);
+  const first = bytes.indexOf(centralDirectorySignature);
+  const second = bytes.indexOf(centralDirectorySignature, first + 4);
+  if (first < 0 || second <= first)
+    throw new Error("Expected two ZIP central-directory entries");
+
+  const firstLocalOffset = bytes.readUInt32LE(first + 42);
+  const secondLocalOffset = bytes.readUInt32LE(second + 42);
+  expect(secondLocalOffset).not.toBe(firstLocalOffset);
+  bytes.writeUInt32LE(firstLocalOffset, second + 42);
+  await writeFile(path, bytes);
+
+  const target = await parseBinaryTarget(path);
+  if (!target.ok) throw target.error;
+  const result = await new ArtifactProvider()
+    .createClient(target.value)
+    .execute("inventory_artifact", {});
+
+  expect(result).toMatchObject({
+    ok: false,
+    error: { _tag: "ArtifactOperationError", reason: "io" },
+  });
+});
+
+it("preserves encrypted-member and corrupt-CRC observations", async () => {
+  const root = await createTestTempDirectory("rea-zip-integrity-");
+  const encryptedPath = join(root, "encrypted.zip");
+  const encryptedWriter = new ZipWriter(new Uint8ArrayWriter());
+  await encryptedWriter.add("secret.txt", new TextReader("secret bytes"), {
+    password: "fixture-password",
+  });
+  await writeFile(encryptedPath, await encryptedWriter.close());
+
+  const encryptedTarget = await parseBinaryTarget(encryptedPath);
+  if (!encryptedTarget.ok) throw encryptedTarget.error;
+  const encryptedResult = await new ArtifactProvider()
+    .createClient(encryptedTarget.value)
+    .execute("inventory_artifact", {});
+  if (!encryptedResult.ok) throw encryptedResult.error;
+  const encryptedInventory = artifactInventoryResultSchema.parse(
+    encryptedResult.value.result,
+  );
+  expect(encryptedInventory.occurrences).toContainEqual(
+    expect.objectContaining({
+      logical_path: "secret.txt",
+      encrypted: true,
+      hash_status: "unavailable",
+    }),
+  );
+
+  const corruptPath = join(root, "corrupt-crc.zip");
+  const corruptWriter = new ZipWriter(new Uint8ArrayWriter());
+  await corruptWriter.add("data.txt", new TextReader("evidence\n"));
+  await writeFile(corruptPath, await corruptWriter.close());
+  const bytes = await readFile(corruptPath);
+  const localFileHeaderSignature = Buffer.from([0x50, 0x4b, 0x03, 0x04]);
+  const localHeader = bytes.indexOf(localFileHeaderSignature);
+  if (localHeader < 0) throw new Error("Expected a ZIP local-file header");
+  const dataOffset =
+    localHeader +
+    30 +
+    bytes.readUInt16LE(localHeader + 26) +
+    bytes.readUInt16LE(localHeader + 28);
+  const firstByte = bytes[dataOffset];
+  if (firstByte === undefined) throw new Error("Expected ZIP member bytes");
+  bytes[dataOffset] = firstByte ^ 1;
+  await writeFile(corruptPath, bytes);
+
+  const corruptTarget = await parseBinaryTarget(corruptPath);
+  if (!corruptTarget.ok) throw corruptTarget.error;
+  const corruptResult = await new ArtifactProvider()
+    .createClient(corruptTarget.value)
+    .execute("inventory_artifact", {});
+  expect(corruptResult).toMatchObject({
+    ok: false,
+    error: { _tag: "ArtifactOperationError", reason: "io" },
+  });
+});
+
+it("rejects a truncated ZIP through artifact inventory", async () => {
+  const root = await createTestTempDirectory("rea-zip-malformed-");
+  const path = join(root, "truncated.zip");
+  await writeFile(path, Buffer.from([0x50, 0x4b, 0x03, 0x04]));
+
+  const target = await parseBinaryTarget(path);
+  if (!target.ok) throw target.error;
+  const result = await new ArtifactProvider()
+    .createClient(target.value)
+    .execute("inventory_artifact", {});
+
+  expect(result).toMatchObject({
+    ok: false,
+    error: { _tag: "ArtifactOperationError", reason: "io" },
+  });
+});