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DEBIAN-CVE-2026-34582

Type: advisorySource: OSV1 source record

Botan is a C++ cryptography library. Prior to version 3.11.1, the TLS 1.3 implementation allowed ApplicationData records to be processed prior to the Finished message being received. A server which is attempting to enforce client authentication via certificates can by bypassed by a client which entirely omits Certificate, CertificateVerify, and the Finished message and instead sends application data records. This vulnerability is fixed in 3.11.1.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-34582

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-2026-34582

botan3

Source reference: /affected/0/package/name

Affected versions
3.10.0+dfsg-1

Source reference: /affected/0/versions

3.10.0+dfsg-2

Source reference: /affected/0/versions

3.11.0+dfsg-1

Source reference: /affected/0/versions

3.7.1+dfsg-2

Source reference: /affected/0/versions

3.8.1+dfsg-1

Source reference: /affected/0/versions

3.9.0+dfsg-1

Source reference: /affected/0/versions

3.9.0+dfsg-2

Source reference: /affected/0/versions

3.9.0+dfsg-2.1

Source reference: /affected/0/versions

Fixed versions
3.11.0+dfsg-2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

botan3

Source reference: /affected/1/package/name

Affected versions
3.10.0+dfsg-1

Source reference: /affected/1/versions

3.10.0+dfsg-2

Source reference: /affected/1/versions

3.11.0+dfsg-1

Source reference: /affected/1/versions

3.7.1+dfsg-2

Source reference: /affected/1/versions

3.8.1+dfsg-1

Source reference: /affected/1/versions

3.9.0+dfsg-1

Source reference: /affected/1/versions

3.9.0+dfsg-2

Source reference: /affected/1/versions

3.9.0+dfsg-2.1

Source reference: /affected/1/versions

Fixed versions
3.11.0+dfsg-2

Source reference: /affected/1/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"
          },
          {
            "fixed": "3.11.0+dfsg-2"
          }
        ]
      }
    ],
    "package": {
      "name": "botan3",
      "purl": "pkg:deb/debian/botan3?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.10.0+dfsg-1",
      "3.10.0+dfsg-2",
      "3.11.0+dfsg-1",
      "3.7.1+dfsg-2",
      "3.8.1+dfsg-1",
      "3.9.0+dfsg-1",
      "3.9.0+dfsg-2",
      "3.9.0+dfsg-2.1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34582.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.11.0+dfsg-2"
          }
        ]
      }
    ],
    "package": {
      "name": "botan3",
      "purl": "pkg:deb/debian/botan3?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.10.0+dfsg-1",
      "3.10.0+dfsg-2",
      "3.11.0+dfsg-1",
      "3.7.1+dfsg-2",
      "3.8.1+dfsg-1",
      "3.9.0+dfsg-1",
      "3.9.0+dfsg-2",
      "3.9.0+dfsg-2.1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34582.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56808 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement