MediumFix available

python-cryptography — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2023-23931

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.

Products: python-cryptography
Affected versions: Not specified
Fixed versions: 38.0.4-3
CVEs: CVE-2023-23931
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 15:32 UTC · Revision 1

Source evidence

DEBIAN-CVE-2023-23931

core-osv · Original source

Published 7 Feb 2023, 21:15 UTC

osv:DEBIAN-CVE-2023-23931

python-cryptography

Fixed versions: 38.0.4-3

python-cryptography

Fixed versions: 38.0.4-3

python-cryptography

Fixed versions: 38.0.4-3

Complete source record

{
  "id": "cbce0874ada828ed47fcf0f2caa3353ec97014316e5a0c8c9ee2792951000c88",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-23931",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2023-23931",
    "summary": "cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.",
    "evidence": "osv:DEBIAN-CVE-2023-23931",
    "products": [
      {
        "name": {
          "value": "python-cryptography",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "38.0.4-3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "python-cryptography",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "38.0.4-3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "python-cryptography",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "38.0.4-3",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2023-23931",
      "aliases": [
        "DEBIAN-CVE-2023-23931"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "38.0.4-3"
                }
              ]
            }
          ],
          "package": {
            "name": "python-cryptography",
            "purl": "pkg:deb/debian/python-cryptography?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-23931.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "38.0.4-3"
                }
              ]
            }
          ],
          "package": {
            "name": "python-cryptography",
            "purl": "pkg:deb/debian/python-cryptography?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-23931.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "38.0.4-3"
                }
              ]
            }
          ],
          "package": {
            "name": "python-cryptography",
            "purl": "pkg:deb/debian/python-cryptography?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-23931.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T18:01:00.859205315Z",
      "provider": "osv",
      "upstream": [
        "CVE-2023-23931"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2023-23931"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2023-23931",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 455286,
  "published_at": "2023-02-07T21:15:09.85+00:00"
}