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psbt: parse the global unsigned tx without witness data
Public commit record
73/100 · Adequate
What the developer wrote
Authored by Sjors Provoost
psbt: parse the global unsigned tx without witness data
The witness-detecting deserializer accepted witness-serialized
unsigned transactions and misread valid ones with no inputs.
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context
What changed, and why it matters
This commit fixes a bug in how the wallet interface reads the unsigned transaction embedded inside a PSBT (Partially Signed Bitcoin Transaction). Previously, the parser tried to auto-detect whether the transaction included witness data, which could misread certain valid transactions that had no inputs. Now it explicitly parses the transaction as a non-witness transaction and rejects any PSBT whose unsigned transaction is not serialized exactly that way. This is a correctness and standards-compliance fix that reduces the chance of a malformed or malicious PSBT being misinterpreted.
Recommended action
Review downstream callers that construct or validate PSBTs to ensure they do not rely on the previous lenient parsing. Update to this commit or a release containing it. Consider adding regression tests for edge-case PSBTs with no inputs or with witness-serialized global transactions.
Security signals we found
01
PSBT global unsigned transaction parsing now strictly enforces non-witness serialization
02
New deserialize_without_witness method removes witness-marker auto-detection
03
Adds explicit PSBTSerializationError for invalid or trailing bytes in the unsigned tx field
04
Test vectors updated with additional valid/invalid PSBT cases
Evidence from the diff
The change adds a new CTransaction.deserialize_without_witness() method in hwilib/tx.py that reads nVersion, vin, vout, an empty witness, and nLockTime without the witness-marker heuristic used by the standard deserializer. In hwilib/psbt.py, PSBT deserialization now calls this method for the global unsigned tx and raises PSBTSerializationError if parsing fails or if any bytes remain after the non-witness transaction. This prevents the old auto-detecting parser from accepting witness-serialized unsigned transactions (forbidden by BIP 174) and from misinterpreting valid no-input transactions whose serialization happened to start with bytes that looked like a witness marker.
Changed components
hwilib/psbt.pyhwilib/tx.pytest/data/test_psbt.jsonInspect captured patch +19 / −3
### hwilib/psbt.py
@@ -835,7 +835,12 @@ def deserialize(self, psbt: str) -> None:
# read in value
tx_bytes = BufferedReader(BytesIO(deser_string(f))) # type: ignore
- self.tx.deserialize(tx_bytes)
+ try:
+ self.tx.deserialize_without_witness(tx_bytes)
+ except Exception:
+ raise PSBTSerializationError("Global unsigned tx is invalid")
+ if len(tx_bytes.read(1)) > 0:
+ raise PSBTSerializationError("Global unsigned tx is not serialized without witness")
# Make sure that all scriptSigs and scriptWitnesses are empty
for txin in self.tx.vin:
### hwilib/tx.py
@@ -240,6 +240,15 @@ def deserialize(self, f: Readable) -> None:
self.sha256 = None
self.hash = None
+ def deserialize_without_witness(self, f: Readable) -> None:
+ self.nVersion = struct.unpack("<i", f.read(4))[0]
+ self.vin = deser_vector(f, CTxIn)
+ self.vout = deser_vector(f, CTxOut)
+ self.wit = CTxWitness()
+ self.nLockTime = struct.unpack("<I", f.read(4))[0]
+ self.sha256 = None
+ self.hash = None
+
def serialize_without_witness(self) -> bytes:
r = b""
r += struct.pack("<i", self.nVersion)
### test/data/test_psbt.json
@@ -39,7 +39,8 @@
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,
"valid" : [
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"creator" : [
{Risk score
Our methodology →Why this scored 59/100
Human-validated context
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