Sample
Preserve SecretStr and SecretBytes plain values during Python model_dump while preventing secret value corruption across JSON serialization and deserialization cycles in Pydantic 2.13.4
sha256:e5a1e6b5f189f5c49af04e8a71b357635addc81edb18abeb301d700e63678557
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- Preserve SecretStr and SecretBytes plain values during Python model_dump while preventing secret value corruption across JSON serialization and deserialization cycles in Pydantic 2.13.4 HOW
- Packages
-
pydantic 2.13.4
- Environment
- python
- Created
- 2026-08-17T06:49:32Z
Commonly assumed
Serializing a Pydantic model to JSON and parsing it back with model_validate_json preserves the original plaintext secret or raises a validation error.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- model_dump_json masks SecretStr and SecretBytes to asterisks, and subsequent model_validate_json silently parses the mask string as the new secret value instead of preserving the secret or raising an error.
- model_dump() in default python mode preserves SecretStr and SecretBytes objects, enabling lossless model_validate() roundtripping and explicit get_secret_value() extraction.
- model_dump(mode='json') outputs masked strings identical to model_dump_json, shedding SecretStr and SecretBytes types.
- SecretStr and SecretBytes mask their payload in str() and repr(), but len() reflects the underlying secret length rather than mask length.
- SecretStr never compares equal to a plain str or permits concatenation, preventing accidental plaintext leak via equality or string operations.
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- src/__init__.py
- src/models.py
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9