HIGH7.5

PYSEC-2026-1283

Python Cryptography package vulnerable to Bleichenbacher timing oracle attack

Quick fix

PYSEC-2026-1283 — cryptography: upgrade to the fixed version with the command below.

pip install --upgrade 'cryptography>=42.0.0'

Details

A flaw was found in the python-cryptography package. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/cryptography

Introduced in: 0Fixed in: 42.0.0

Fixpip install --upgrade 'cryptography>=42.0.0'

References

https://nvd.nist.gov/vuln/detail/CVE-2023-50782[ADVISORY]
https://github.com/pyca/cryptography/issues/9785[WEB]
https://access.redhat.com/security/cve/CVE-2023-50782[WEB]
https://bugzilla.redhat.com/show_bug.cgi?id=2254432[WEB]
https://github.com/pyca/cryptography[PACKAGE]
https://www.couchbase.com/alerts[WEB]
https://pypi.org/project/cryptography[PACKAGE]
https://github.com/advisories/GHSA-3ww4-gg4f-jr7f[ADVISORY]