PYSEC-2026-1283

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:23
VLAI
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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7 (High)
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
Impacted products
Name purl
cryptography pkg:pypi/cryptography
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "cryptography",
        "purl": "pkg:pypi/cryptography"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "42.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-50782",
    "GHSA-3ww4-gg4f-jr7f"
  ],
  "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.",
  "id": "PYSEC-2026-1283",
  "modified": "2026-07-07T17:23:58.614342Z",
  "published": "2026-07-07T11:45:32.057431Z",
  "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": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Python Cryptography package vulnerable to Bleichenbacher timing oracle attack"
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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