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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
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cryptography 50.0.0 release notes Python 3.9.0 3.9.1 deprecations finite-field DH X.509 OCSP SCT PKCS7 serialization💡 Result:
The cryptography library version 50.0.0, released on July 31, 2026, introduces several significant changes, deprecations, and security updates [1][2]. Deprecations and Security Updates - Diffie-Hellman Key Exchange (FFDH): Finite-field Diffie-Hellman (FFDH) is now deprecated [1][2]. This deprecation encompasses all associated types in cryptography.hazmat.primitives.asymmetric.dh and includes loading FFDH keys or parameters via the key loading APIs [1][2]. Users are advised to migrate to more modern key exchange algorithms [1][2]. - PKCS7 Security Fix: A security issue involving pkcs7_decrypt_der and its PEM/S/MIME variants was addressed [1][2]. These functions no longer expose distinguishable errors or timing when unwrapping a RecipientInfo encryptedKey to prevent potential Bleichenbacher oracle attacks [1][2]. A random key is substituted upon failure, following RFC 3218 [1][2]. X.509, OCSP, and SCT Updates - Stability: X.509 verification APIs are now considered stable and subject to the project's API stability policy [1][2]. - SCT Parsing: Parsing a Signed Certificate Timestamp (SCT) list now rejects encodings that contain trailing bytes after the list or after an individual SCT, rather than silently ignoring them [2][3]. - X.509/ASN.1: Support was added for using x509.Name as a field type in the cryptography.hazmat.asn1 module [2][4]. Additionally, parsing a CRL entry's InvalidityDate extension now strictly rejects GeneralizedTime values that contain fractional seconds or other non-DER forms [2]. Python Support - The cryptography library currently supports Python 3.9+ [2]. Support for older versions, such as Python 3.8, was removed in earlier releases (e.g., v48.0.0) [5]. Other Notable Changes - New features include the addition of xof class methods to SHAKE128 and SHAKE256 for XOFHash usage and the introduction of the Cobblestone recipe for streaming authenticated encryption [1][2]. Additionally, public key and EC private key loading now reject DER encodings where the BIT STRING declares a non-zero number of unused bits [2][4].
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cryptography 50.0.0 changelog release notes supported Python versions deprecations💡 Result:
The cryptography library version 50.0.0 was released on July 31, 2026 [1]. Supported Python Versions Cryptography 50.0.0 supports Python 3.9+ and PyPy3 3.11+ [2]. Key Changes and Deprecations in 50.0.0 - Security Issue: pkcs7_decrypt_der (including PEM and S/MIME variants) was updated to prevent a Bleichenbacher oracle vulnerability. It no longer exposes distinguishable errors or timing when unwrapping an encryptedKey; instead, a random key is substituted on failure [1][2]. - Deprecation: Diffie-Hellman key exchange over finite fields (FFDH) is now deprecated [1][2]. This includes the types in cryptography.hazmat.primitives.asymmetric.dh and loading FFDH keys or parameters via key loading APIs. Users are advised to migrate to modern key exchange algorithms [1][2]. - API Updates: - Added xof class methods to SHAKE128 and SHAKE256 for use with XOFHash [1][2]. - X.509 verification APIs are now considered stable and subject to the project's API stability policy [1][2]. - Introduced the Cobblestone recipe (implementing Cobblestone-128 and Cobblestone-256 for chunked-encryption) [2]. - Behavioral Changes: - Parsing a Signed Certificate Timestamp (SCT) list now strictly rejects encodings containing trailing bytes [2]. - Loading a public or EC private key now rejects DER where the subjectPublicKey/publicKey BIT STRING declares a non-zero number of unused bits [2]. - Parsing an InvalidityDate extension now rejects non-DER forms (such as those with fractional seconds) [2]. - Added support for using x509.Name as a field type in the cryptography.hazmat.asn1 module [2].
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Pin and scope the
cryptographycompatibility check. Replacecryptography>=50.0.0withcryptography==50.0.0and updateuv.lock. The project requires Python>=3.11, so Python 3.9.0 and 3.9.1 are outside its support range. Repository usage is limited to X.509 certificate loading and test certificate generation; no finite-field DH, X.509 verification, OCSP/SCT, PKCS#7, or key-serialization call sites require migration tests.🤖 Prompt for AI Agents
🔒 Security & Privacy | 🟡 Minor | ⚡ Quick win
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uv documentation whetheruv pip installreads or enforcesuv.lock, and how to install from a uv lockfile in production💡 Result:
The
uv pip installcommand does not read or enforceuv.lock[1][2]. Theuv pipinterface is designed as an alternative topipandpip-toolsand interacts with packages similarly to traditional pip, without awareness of the project-specificuv.lockfile [1][2][3]. To install from a lockfile in production, you should useuv sync[4][5]. ### Installing from a Lockfile in Production For reproducible production environments—such as in CI/CD pipelines or Docker builds—theuv synccommand is the standard and recommended approach [4][6][5]. * Standard Usage: Runninguv syncwill automatically lock (if necessary) and sync the environment to match the dependencies specified inuv.lock[4]. * Production/Docker Usage: To ensure strict adherence to the lockfile during build processes, use:uv sync --frozen --no-install-project[7][5] *--frozen: This flag forcesuvto use the existinguv.lockfile as-is without attempting to update or re-resolve dependencies [7][6]. It will cause the operation to fail if the lockfile is missing or out of sync withpyproject.toml[6]. *--no-install-project: This is often used in Docker builds to install only the dependencies into the environment without installing the current project itself, which is useful for optimizing layer caching [4][7][5]. By usinguv sync --frozen, you guarantee that the exact versions specified in youruv.lockare installed, providing the reproducibility required for production deployments [6][5].Citations:
uv pip install, because it does not honor uv.lock invoke-ai/launcher#131Security Misconfiguration (CWE-494): Download of Code Without Integrity Check
Reachability: External · Exploitability: Moderate
Install production dependencies from
uv.lock.uv.lockrecords hashes forcryptography==50.0.0, and CI runsuv audit --locked. The production container usesuv pip install -e ., which ignoresuv.lockand resolves the open-ended requirements. Replace it withuv sync --frozenor an equivalent hashed installation.🤖 Prompt for AI Agents
Source: Path instructions
🔒 Security & Privacy | 🟠 Major | ⚡ Quick win
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Dependency Version Not Pinned (CWE-829): Inclusion of Functionality from Untrusted Control Sphere
Reachability: External · Exploitability: Difficult
Pin the production dependency to an exact version.
uv.lockcurrently resolvescryptographyto50.0.0with hashes, but the project metadata still permits later versions. Usecryptography==50.0.0and updateuv.lock.Suggested change
📝 Committable suggestion
🤖 Prompt for AI Agents
Source: Path instructions