id: PYSEC-2026-1283
published: "2026-07-07T11:45:32.057431Z"
modified: "2026-07-07T17:23:58.614342Z"
aliases:
- CVE-2023-50782
- GHSA-3ww4-gg4f-jr7f
summary: Python Cryptography package vulnerable to Bleichenbacher timing oracle attack
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.
affected:
- package:
    name: cryptography
    ecosystem: PyPI
    purl: pkg:pypi/cryptography
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 42.0.0
  versions:
  - "0.1"
  - "0.2"
  - 0.2.1
  - 0.2.2
  - "0.3"
  - "0.4"
  - "0.5"
  - 0.5.1
  - 0.5.2
  - 0.5.3
  - 0.5.4
  - "0.6"
  - 0.6.1
  - "0.7"
  - 0.7.1
  - 0.7.2
  - "0.8"
  - 0.8.1
  - 0.8.2
  - "0.9"
  - 0.9.1
  - 0.9.2
  - 0.9.3
  - "1.0"
  - 1.0.1
  - 1.0.2
  - "1.1"
  - 1.1.1
  - 1.1.2
  - "1.2"
  - 1.2.1
  - 1.2.2
  - 1.2.3
  - "1.3"
  - 1.3.1
  - 1.3.2
  - 1.3.3
  - 1.3.4
  - "1.4"
  - "1.5"
  - 1.5.1
  - 1.5.2
  - 1.5.3
  - "1.6"
  - "1.7"
  - 1.7.1
  - 1.7.2
  - "1.8"
  - 1.8.1
  - 1.8.2
  - "1.9"
  - "2.0"
  - 2.0.1
  - 2.0.2
  - 2.0.3
  - "2.1"
  - 2.1.1
  - 2.1.2
  - 2.1.3
  - 2.1.4
  - "2.2"
  - 2.2.1
  - 2.2.2
  - "2.3"
  - 2.3.1
  - "2.4"
  - 2.4.1
  - 2.4.2
  - "2.5"
  - "2.6"
  - 2.6.1
  - "2.7"
  - "2.8"
  - "2.9"
  - 2.9.1
  - 2.9.2
  - "3.0"
  - "3.1"
  - 3.1.1
  - "3.2"
  - 3.2.1
  - "3.3"
  - 3.3.1
  - 3.3.2
  - "3.4"
  - 3.4.1
  - 3.4.2
  - 3.4.3
  - 3.4.4
  - 3.4.5
  - 3.4.6
  - 3.4.7
  - 3.4.8
  - 35.0.0
  - 36.0.0
  - 36.0.1
  - 36.0.2
  - 37.0.0
  - 37.0.1
  - 37.0.2
  - 37.0.3
  - 37.0.4
  - 38.0.0
  - 38.0.1
  - 38.0.2
  - 38.0.3
  - 38.0.4
  - 39.0.0
  - 39.0.1
  - 39.0.2
  - 40.0.0
  - 40.0.1
  - 40.0.2
  - 41.0.0
  - 41.0.1
  - 41.0.2
  - 41.0.3
  - 41.0.4
  - 41.0.5
  - 41.0.6
  - 41.0.7
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2023-50782
- type: WEB
  url: https://github.com/pyca/cryptography/issues/9785
- type: WEB
  url: https://access.redhat.com/security/cve/CVE-2023-50782
- type: WEB
  url: https://bugzilla.redhat.com/show_bug.cgi?id=2254432
- type: PACKAGE
  url: https://github.com/pyca/cryptography
- type: WEB
  url: https://www.couchbase.com/alerts
- type: PACKAGE
  url: https://pypi.org/project/cryptography
- type: ADVISORY
  url: https://github.com/advisories/GHSA-3ww4-gg4f-jr7f
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N