diff --git a/.github/workflows/auto_merge_codex_pr.yml b/.github/workflows/auto_merge_codex_pr.yml
index dc994fa..7dd1a0e 100644
--- a/.github/workflows/auto_merge_codex_pr.yml
+++ b/.github/workflows/auto_merge_codex_pr.yml
@@ -9,6 +9,7 @@ jobs:
   auto-merge:
     if: github.event.workflow_run.conclusion == 'success' && startsWith(github.event.workflow_run.head_branch, 'codex/monthly-review-issue-')
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     permissions:
       contents: write
       pull-requests: write
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1424bc4..6fc82b0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,9 +5,13 @@ on:
     branches: [main]
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest
+    timeout-minutes: 20
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
diff --git a/.github/workflows/codex_pr_feedback.yml b/.github/workflows/codex_pr_feedback.yml
index ea61cf7..28681b1 100644
--- a/.github/workflows/codex_pr_feedback.yml
+++ b/.github/workflows/codex_pr_feedback.yml
@@ -11,6 +11,7 @@ jobs:
   ci-feedback:
     if: github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'failure' && startsWith(github.event.workflow_run.head_branch, 'codex/monthly-review-issue-')
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     permissions:
       issues: write
       pull-requests: read
@@ -114,6 +115,7 @@ jobs:
   review-feedback:
     if: github.event_name == 'pull_request_review' && github.event.review.state == 'changes_requested' && startsWith(github.event.pull_request.head.ref, 'codex/monthly-review-issue-')
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     permissions:
       issues: write
 
diff --git a/.github/workflows/monthly_review.yml b/.github/workflows/monthly_review.yml
index 882e444..e0c8725 100644
--- a/.github/workflows/monthly_review.yml
+++ b/.github/workflows/monthly_review.yml
@@ -15,10 +15,15 @@ name: Monthly Snapshot Review
         required: false
         default: ""
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: false
+
 jobs:
   monthly-review:
     if: github.event_name == 'workflow_dispatch' || (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success' && contains(fromJSON('["schedule","workflow_run"]'), github.event.workflow_run.event))
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     concurrency:
       group: monthly-snapshot-review-${{ github.ref_name }}
       cancel-in-progress: false
@@ -162,7 +167,7 @@ jobs:
                       "User-Agent": "us-equity-snapshot-monthly-review",
                   },
               )
-              with urllib.request.urlopen(request) as response:
+              with urllib.request.urlopen(request, timeout=30) as response:
                   return response.status
 
           def dispatch_codex() -> None:
diff --git a/.github/workflows/publish-snapshot-artifacts.yml b/.github/workflows/publish-snapshot-artifacts.yml
index 07578a6..e566c1d 100644
--- a/.github/workflows/publish-snapshot-artifacts.yml
+++ b/.github/workflows/publish-snapshot-artifacts.yml
@@ -69,10 +69,15 @@ on:
         required: false
         type: string
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: false
+
 jobs:
   build-and-publish:
     if: github.event_name != 'workflow_run' || (github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'schedule')
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:
@@ -456,6 +461,7 @@ jobs:
     needs: build-and-publish
     if: ${{ failure() && github.event_name == 'schedule' && fromJSON(github.run_attempt) < 2 }}
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     permissions:
       actions: write
       contents: read
diff --git a/.github/workflows/publish-strategy-plugins.yml b/.github/workflows/publish-strategy-plugins.yml
index 676b247..c3678bd 100644
--- a/.github/workflows/publish-strategy-plugins.yml
+++ b/.github/workflows/publish-strategy-plugins.yml
@@ -37,9 +37,14 @@ on:
         required: false
         type: string
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: false
+
 jobs:
   market-regime-control:
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:
@@ -361,6 +366,7 @@ jobs:
 
   crisis-response-shadow:
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     strategy:
       fail-fast: false
       matrix:
@@ -572,6 +578,7 @@ jobs:
 
   taco-rebound-shadow:
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     permissions:
       contents: read
       id-token: write
diff --git a/.github/workflows/snapshot-artifact-health.yml b/.github/workflows/snapshot-artifact-health.yml
index fe5f102..cfaf5fb 100644
--- a/.github/workflows/snapshot-artifact-health.yml
+++ b/.github/workflows/snapshot-artifact-health.yml
@@ -20,9 +20,14 @@ on:
         default: '1'
         type: string
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: false
+
 jobs:
   check:
     runs-on: ubuntu-latest
+    timeout-minutes: 20
     strategy:
       fail-fast: false
       matrix:
diff --git a/.github/workflows/update-source-input-data.yml b/.github/workflows/update-source-input-data.yml
index d0ebd9a..30832e6 100644
--- a/.github/workflows/update-source-input-data.yml
+++ b/.github/workflows/update-source-input-data.yml
@@ -65,9 +65,14 @@ on:
         default: '100'
         type: string
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: false
+
 jobs:
   update-inputs:
     runs-on: ubuntu-latest
+    timeout-minutes: 20
     permissions:
       actions: write
       contents: read
@@ -285,6 +290,7 @@ jobs:
     needs: update-inputs
     if: ${{ failure() && github.event_name == 'schedule' && fromJSON(github.run_attempt) < 2 }}
     runs-on: ubuntu-latest
+    timeout-minutes: 20
     permissions:
       actions: write
       contents: read
diff --git a/scripts/post_monthly_ai_review_issue.py b/scripts/post_monthly_ai_review_issue.py
index 7fe5ef5..20d6281 100644
--- a/scripts/post_monthly_ai_review_issue.py
+++ b/scripts/post_monthly_ai_review_issue.py
@@ -13,9 +13,17 @@
 
 DEFAULT_API_URL = "https://api.github.com"
 DEFAULT_LABEL = "monthly-review"
+DEFAULT_TIMEOUT_SECONDS = 30
 
 
-def github_request(method: str, url: str, token: str, payload: dict[str, Any] | None = None) -> Any:
+def github_request(
+    method: str,
+    url: str,
+    token: str,
+    payload: dict[str, Any] | None = None,
+    *,
+    timeout: float = DEFAULT_TIMEOUT_SECONDS,
+) -> Any:
     data = None
     headers = {
         "Accept": "application/vnd.github+json",
@@ -27,7 +35,7 @@ def github_request(method: str, url: str, token: str, payload: dict[str, Any] |
         data = json.dumps(payload).encode("utf-8")
         headers["Content-Type"] = "application/json"
     request = urllib.request.Request(url, data=data, headers=headers, method=method)
-    with urllib.request.urlopen(request) as response:
+    with urllib.request.urlopen(request, timeout=timeout) as response:
         charset = response.headers.get_content_charset("utf-8")
         raw = response.read().decode(charset)
         return json.loads(raw) if raw else None
diff --git a/src/us_equity_snapshot_pipelines/input_sources.py b/src/us_equity_snapshot_pipelines/input_sources.py
index addcae0..4ca3b62 100644
--- a/src/us_equity_snapshot_pipelines/input_sources.py
+++ b/src/us_equity_snapshot_pipelines/input_sources.py
@@ -1,16 +1,30 @@
 from __future__ import annotations
 
 import argparse
+import shutil
 import shlex
 import subprocess
 from collections.abc import Callable
 from dataclasses import dataclass
 from pathlib import Path
 from urllib.parse import urlparse
-from urllib.request import urlretrieve
+from urllib.request import Request, urlopen
 
 SUPPORTED_TABLE_SUFFIXES = frozenset({".csv", ".json", ".jsonl", ".parquet"})
 SUPPORTED_CONFIG_SUFFIXES = frozenset({".json"})
+DEFAULT_REMOTE_COPY_TIMEOUT_SECONDS = 60
+SENSITIVE_REMOTE_SOURCE_QUERY_MARKERS = (
+    "access_token=",
+    "api_key=",
+    "auth=",
+    "jwt=",
+    "password=",
+    "secret=",
+    "signature=",
+    "token=",
+    "x-amz-signature=",
+    "x-goog-signature=",
+)
 
 CopyFn = Callable[[str, Path], None]
 
@@ -37,12 +51,23 @@ def source_needs_gcloud(source: str | None) -> bool:
     return is_gcs_uri(str(source or ""))
 
 
+def _reject_sensitive_remote_source(source: str) -> None:
+    normalized = str(source or "").strip().lower()
+    if not (is_gcs_uri(normalized) or is_http_uri(normalized)):
+        return
+    for marker in SENSITIVE_REMOTE_SOURCE_QUERY_MARKERS:
+        if marker in normalized:
+            raise ValueError("remote input URI must not contain token/password/signature-like query parameters")
+
+
 def _default_gcs_copy(source: str, target: Path) -> None:
     subprocess.run(["gcloud", "storage", "cp", source, str(target)], check=True)
 
 
 def _default_http_copy(source: str, target: Path) -> None:
-    urlretrieve(source, target)  # noqa: S310 - operator-supplied data source URL.
+    request = Request(source, headers={"User-Agent": "us-equity-snapshot-pipelines"})
+    with urlopen(request, timeout=DEFAULT_REMOTE_COPY_TIMEOUT_SECONDS) as response, target.open("wb") as output:  # noqa: S310 - operator-supplied data source URL.
+        shutil.copyfileobj(response, output)
 
 
 def _source_suffix(source: str, *, allowed_suffixes: frozenset[str], default_suffix: str) -> str:
@@ -69,6 +94,8 @@ def resolve_input_source(
     output_root = Path(output_dir)
     output_root.mkdir(parents=True, exist_ok=True)
 
+    _reject_sensitive_remote_source(source_text)
+
     if is_gcs_uri(source_text):
         target = output_root / f"{stem}{_source_suffix(source_text, allowed_suffixes=allowed_suffixes, default_suffix=default_suffix)}"
         (gcs_copy or _default_gcs_copy)(source_text, target)
diff --git a/tests/test_input_sources.py b/tests/test_input_sources.py
index 91e6245..b87b6e1 100644
--- a/tests/test_input_sources.py
+++ b/tests/test_input_sources.py
@@ -4,7 +4,13 @@
 
 import pytest
 
-from us_equity_snapshot_pipelines.input_sources import resolve_input_source, resolve_input_sources, source_needs_gcloud
+from us_equity_snapshot_pipelines.input_sources import (
+    DEFAULT_REMOTE_COPY_TIMEOUT_SECONDS,
+    _default_http_copy,
+    resolve_input_source,
+    resolve_input_sources,
+    source_needs_gcloud,
+)
 
 
 def test_resolves_local_input_without_copying(tmp_path) -> None:
@@ -59,3 +65,42 @@ def test_source_needs_gcloud_only_for_gcs() -> None:
     assert source_needs_gcloud("gs://bucket/path.csv") is True
     assert source_needs_gcloud("https://example.com/path.csv") is False
     assert source_needs_gcloud("data/prices.csv") is False
+
+
+def test_resolve_input_source_rejects_secret_like_remote_uri(tmp_path) -> None:
+    with pytest.raises(ValueError, match="must not contain token"):
+        resolve_input_source(
+            "https://example.com/prices.csv?token=abc",
+            output_dir=tmp_path / "resolved",
+            stem="prices",
+        )
+
+
+def test_default_http_copy_uses_timeout_and_streams_response(monkeypatch, tmp_path) -> None:
+    calls: list[tuple[str, float]] = []
+
+    class FakeResponse:
+        def __init__(self) -> None:
+            self._payload = b"symbol,close\nQQQ,100\n"
+
+        def __enter__(self) -> "FakeResponse":
+            return self
+
+        def __exit__(self, *args: object) -> None:
+            return None
+
+        def read(self, size: int = -1) -> bytes:
+            payload, self._payload = self._payload, b""
+            return payload
+
+    def fake_urlopen(request, *, timeout: float):
+        calls.append((request.full_url, timeout))
+        return FakeResponse()
+
+    monkeypatch.setattr("us_equity_snapshot_pipelines.input_sources.urlopen", fake_urlopen)
+    target = tmp_path / "prices.csv"
+
+    _default_http_copy("https://example.com/prices.csv", target)
+
+    assert target.read_text(encoding="utf-8") == "symbol,close\nQQQ,100\n"
+    assert calls == [("https://example.com/prices.csv", DEFAULT_REMOTE_COPY_TIMEOUT_SECONDS)]
diff --git a/tests/test_post_monthly_ai_review_issue.py b/tests/test_post_monthly_ai_review_issue.py
new file mode 100644
index 0000000..ebe700c
--- /dev/null
+++ b/tests/test_post_monthly_ai_review_issue.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import importlib.util
+from pathlib import Path
+
+
+SCRIPT = Path(__file__).resolve().parents[1] / "scripts" / "post_monthly_ai_review_issue.py"
+
+
+def _load_script_module():
+    spec = importlib.util.spec_from_file_location("post_monthly_ai_review_issue", SCRIPT)
+    assert spec is not None
+    assert spec.loader is not None
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+def test_github_request_uses_default_timeout(monkeypatch) -> None:
+    module = _load_script_module()
+    calls: list[tuple[str, str, float]] = []
+
+    class FakeHeaders:
+        def get_content_charset(self, default: str) -> str:
+            return default
+
+    class FakeResponse:
+        headers = FakeHeaders()
+
+        def __enter__(self) -> "FakeResponse":
+            return self
+
+        def __exit__(self, *args: object) -> None:
+            return None
+
+        def read(self) -> bytes:
+            return b'{"ok": true}'
+
+    def fake_urlopen(request, *, timeout: float):
+        calls.append((request.get_method(), request.full_url, timeout))
+        return FakeResponse()
+
+    monkeypatch.setattr(module.urllib.request, "urlopen", fake_urlopen)
+
+    result = module.github_request("GET", "https://api.github.com/repos/example/repo/issues", "token")
+
+    assert result == {"ok": True}
+    assert calls == [
+        ("GET", "https://api.github.com/repos/example/repo/issues", module.DEFAULT_TIMEOUT_SECONDS),
+    ]