cryptography: PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle through distinguishable errors and timing

Summarypkcs7decryptder, pkcs7decryptpem, and pkcs7decryptsmime reported theoutcome of decrypting a RecipientInfo's encryptedKey in severaldistinguishable ways, one of which disclosed the exact length recovered from theRSA operation. The same distinction was also observable by timing. Anapplicatio...

CVE-2026-69247

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 44.0.0 until 50.0.0, pkcs7decryptder, pkcs7decryptpem, and pkcs7decryptsmime reported the outcome of decrypting a RecipientInfo's encryptedKey in several distinguishable ways, one of which...

CVE-2026-69247

The CVE-2026-69247 entry concerns the Python cryptography package (versions 44.0.0 through 50.0.0) where pkcs7_decrypt_der, pkcs7_decrypt_pem, and pkcs7_decrypt_smime reveal distinguishable outcomes or timing when decrypting an EnvelopedData RecipientInfo encryptedKey. This creates a Bleichenbach...