Bump cryptography from 49.0.0 to 50.0.0 #846

Bumps cryptography from 49.0.0 to 50.0.0.

Changelog

Sourced from cryptography's changelog.

50.0.0 - 2026-07-31

* SECURITY ISSUE:

  :func:~cryptography.hazmat.primitives.serialization.pkcs7.pkcs7_decrypt_der

  and its PEM and S/MIME variants no longer expose distinguishable errors or

  timing when unwrapping a RecipientInfo's encryptedKey, which could

  act as a Bleichenbacher oracle for callers that decrypt untrusted messages.

  A random key is now substituted on failure, as described in :rfc:3218.

  Credit to @X1AOxiang for reporting the issue. CVE-2026-69247

* Deprecated Diffie-Hellman key exchange over finite fields (FFDH).

  Everything FFDH is deprecated, including the types in

  cryptography.hazmat.primitives.asymmetric.dh and loading FFDH keys or

  parameters with the key loading APIs. Users should migrate to a more

  modern key exchange algorithm.

* Added xof() class methods to

  :class:~cryptography.hazmat.primitives.hashes.SHAKE128 and

  :class:~cryptography.hazmat.primitives.hashes.SHAKE256 for constructing

  algorithm instances configured for use with

  :class:~cryptography.hazmat.primitives.hashes.XOFHash.

* The :mod:X.509 verification <cryptography.x509.verification> APIs are now

  considered stable and are subject to our API stability policy.

* Added the :doc:/cobblestone recipe, an implementation of the

  Cobblestone-128 and Cobblestone-256 instantiations of the C2SP

  chunked-encryption specification

  <https://c2sp.org/chunked-encryption>_ for streaming authenticated

  encryption of large messages.

* Parsing a Signed Certificate Timestamp list now rejects encodings that

  carry trailing bytes after the list or after an individual SCT, instead of

  silently ignoring them.

* Added support for using :class:~cryptography.x509.Name as a field type in

  the :doc:/hazmat/asn1/index module.

* Loading a public key or an EC private key now rejects DER where the

  subjectPublicKey (or EC publicKey) BIT STRING declares a non-zero

  number of unused bits, instead of silently ignoring it.

* Parsing a CRL entry's InvalidityDate extension now rejects a

  GeneralizedTime that carries fractional seconds or another non-DER form,

  matching the strict encoding already required for every other X.509 time

  field.

* :func:~cryptography.x509.ocsp.load_der_ocsp_request and

  :func:~cryptography.x509.ocsp.load_der_ocsp_response now reject a request

  or response whose version field is not v1, the only version defined

  by RFC 6960, matching the version validation already performed when loading

  certificates, CSRs and CRLs.

* :class:~cryptography.hazmat.primitives.hashes.XOFHash is now supported

  when building against AWS-LC.

* HMAC (and therefore PBKDF2-HMAC) with SHA-3 hashes is now supported when

  building against AWS-LC.

* Diffie-Hellman (:doc:/hazmat/primitives/asymmetric/dh) is now supported

  when building against AWS-LC.

</tr></table> 

... (truncated)

Commits

• 
  dcb7050 Prepare for 50.0.0 release (#15372)


• 
  53fccd9 Don't leak how PKCS#7 encryptedKey decryption failed (#15369)


• 
  d472f97 Add from future import annotations to all src/ Python files (#15371)


• 
  908773d Bump downstream dependencies in CI (#15368)


• 
  2cc07cc Bump BoringSSL, OpenSSL, AWS-LC in CI (#15367)


• 
  c94ede9 chore(deps): bump ruff from 0.16.0 to 0.16.1 (#15366)


• 
  67a8308 chore(deps): bump virtualenv from 21.7.0 to 21.7.1 (#15365)


• 
  95018ff Release the GIL in one-shot AEAD encrypt/decrypt (#15361)


• 
  6954733 Release the GIL during DH and DSA parameter generation (#15364)


• 
  6893b94 Import _serialization instead of serialization in x509/extensions (#15363)


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