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DEBIAN-CVE-2026-27448

Type: advisorySource: OSV1 source record

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-27448

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-27448

pyopenssl

Source reference: /affected/0/package/name

Affected versions
23.0.0-1

Source reference: /affected/0/versions

23.2.0-1

Source reference: /affected/0/versions

24.0.0-1

Source reference: /affected/0/versions

24.0.0-2

Source reference: /affected/0/versions

24.0.0-3

Source reference: /affected/0/versions

24.0.0-4

Source reference: /affected/0/versions

24.0.0-5

Source reference: /affected/0/versions

24.1.0-1

Source reference: /affected/0/versions

24.2.1-1

Source reference: /affected/0/versions

24.3.0-1

Source reference: /affected/0/versions

25.0.0-1

Source reference: /affected/0/versions

25.1.0-1

Source reference: /affected/0/versions

25.1.0-2

Source reference: /affected/0/versions

25.3.0-1

Source reference: /affected/0/versions

25.3.0-2

Source reference: /affected/0/versions

26.0.0-1

Source reference: /affected/0/versions

26.1.0-1

Source reference: /affected/0/versions

26.2.0-1

Source reference: /affected/0/versions

26.2.0-1~exp1

Source reference: /affected/0/versions

26.3.0-1

Source reference: /affected/0/versions

26.3.0-1~exp1

Source reference: /affected/0/versions

26.4.0-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

pyopenssl

Source reference: /affected/1/package/name

Affected versions
25.0.0-1

Source reference: /affected/1/versions

Fixed versions
25.0.0-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

pyopenssl

Source reference: /affected/2/package/name

Affected versions
25.0.0-1

Source reference: /affected/2/versions

25.1.0-1

Source reference: /affected/2/versions

25.1.0-2

Source reference: /affected/2/versions

25.3.0-1

Source reference: /affected/2/versions

25.3.0-2

Source reference: /affected/2/versions

Fixed versions
26.0.0-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "pyopenssl",
      "purl": "pkg:deb/debian/pyopenssl?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "23.0.0-1",
      "23.2.0-1",
      "24.0.0-1",
      "24.0.0-2",
      "24.0.0-3",
      "24.0.0-4",
      "24.0.0-5",
      "24.1.0-1",
      "24.2.1-1",
      "24.3.0-1",
      "25.0.0-1",
      "25.1.0-1",
      "25.1.0-2",
      "25.3.0-1",
      "25.3.0-2",
      "26.0.0-1",
      "26.1.0-1",
      "26.2.0-1",
      "26.2.0-1~exp1",
      "26.3.0-1",
      "26.3.0-1~exp1",
      "26.4.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27448.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "25.0.0-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "pyopenssl",
      "purl": "pkg:deb/debian/pyopenssl?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "25.0.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27448.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "26.0.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "pyopenssl",
      "purl": "pkg:deb/debian/pyopenssl?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "25.0.0-1",
      "25.1.0-1",
      "25.1.0-2",
      "25.3.0-1",
      "25.3.0-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27448.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56292 · Revision 1
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Publisher date
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Revision history

  1. DEBIAN-CVE-2026-27448 · Revision 1Source updated