Hi,

The following vulnerability was published for python-cryptography.

CVE-2026-69247[0]:
| cryptography is a package designed to expose cryptographic
| primitives and recipes to Python developers. From 44.0.0 until
| 50.0.0, pkcs7_decrypt_der, pkcs7_decrypt_pem, and
| pkcs7_decrypt_smime reported the outcome of decrypting a
| RecipientInfo's encryptedKey in several distinguishable ways, one of
| which disclosed the exact length recovered from the RSA operation.
| The same distinction was also observable by timing. An application
| that decrypts attacker-supplied EnvelopedData and reflects the
| outcome gives the attacker a Bleichenbacher oracle against the
| content-encryption key. Decryption ran as RSA PKCS#1 v1.5 decrypt of
| encryptedKey, build an AES cipher from the result, then AES-CBC
| decrypt and PKCS#7 unpad. Invalid RSA padding, a valid padding with
| a bad key length, a correct length with a wrong key, and the real
| key each failed or succeeded differently. Case 1 is reachable only
| where the linked library lacks implicit rejection: OpenSSL 3.0 and
| 3.1, LibreSSL, and BoringSSL. Exploitation requires a service that
| auto-decrypts untrusted EnvelopedData matching the victim
| certificate and answers adaptively at high volume, such as an S/MIME
| gateway or mail filter. This issue is fixed in 50.0.0.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-69247
https://www.cve.org/CVERecord?id=CVE-2026-69247
[1] https://github.com/pyca/cryptography/security/advisories/GHSA-g6cj-pr64-35w5
[2] https://github.com/pyca/cryptography/pull/15369
[3] https://github.com/pyca/cryptography/commit/53fccd93413a8d7f07d6d8999681f27b75cffa3f

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

We believe that the bug you reported is fixed in the latest version of
python-cryptography, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1143596@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Andrey Rakhmatullin <wrar@debian.org> (supplier of updated python-cryptography package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Wed, 05 Aug 2026 01:32:33 +0500
Source: python-cryptography
Architecture: source
Version: 49.0.0-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <team+python@tracker.debian.org>
Changed-By: Andrey Rakhmatullin <wrar@debian.org>
Closes: 1143596
Changes:
 python-cryptography (49.0.0-2) unstable; urgency=medium
 .
   * Backport the upstream fix for CVE-2026-69247 (Closes: #1143596).
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