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DEBIAN-CVE-2026-34874

Type: advisorySource: OSV1 source record

An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-34874

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-2026-34874

mbedtls

Source reference: /affected/0/package/name

Affected versions
2.28.3-1

Source reference: /affected/0/versions

2.28.4-1

Source reference: /affected/0/versions

2.28.5-1

Source reference: /affected/0/versions

2.28.6-1

Source reference: /affected/0/versions

2.28.7-1

Source reference: /affected/0/versions

2.28.7-1.1

Source reference: /affected/0/versions

2.28.7-1.1~exp1

Source reference: /affected/0/versions

2.28.8-1

Source reference: /affected/0/versions

3.6.0-1

Source reference: /affected/0/versions

3.6.0-2

Source reference: /affected/0/versions

3.6.0-3

Source reference: /affected/0/versions

3.6.2-1

Source reference: /affected/0/versions

3.6.2-2

Source reference: /affected/0/versions

3.6.2-3

Source reference: /affected/0/versions

3.6.3-1

Source reference: /affected/0/versions

3.6.4-1

Source reference: /affected/0/versions

3.6.4-2

Source reference: /affected/0/versions

3.6.5-0.1

Source reference: /affected/0/versions

3.6.5-0.1~deb13u1

Source reference: /affected/0/versions

3.6.6-0.1

Source reference: /affected/0/versions

3.6.6-0.1~deb13u1

Source reference: /affected/0/versions

3.6.7-2

Source reference: /affected/0/versions

3.6.7-3

Source reference: /affected/0/versions

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

mbedtls

Source reference: /affected/1/package/name

Affected versions
3.6.4-2

Source reference: /affected/1/versions

3.6.5-0.1

Source reference: /affected/1/versions

3.6.5-0.1~deb13u1

Source reference: /affected/1/versions

Fixed versions
3.6.6-0.1~deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

mbedtls

Source reference: /affected/2/package/name

Affected versions
3.6.4-2

Source reference: /affected/2/versions

3.6.5-0.1

Source reference: /affected/2/versions

3.6.5-0.1~deb13u1

Source reference: /affected/2/versions

3.6.6-0.1~deb13u1

Source reference: /affected/2/versions

Fixed versions
3.6.6-0.1

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": "mbedtls",
      "purl": "pkg:deb/debian/mbedtls?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.28.3-1",
      "2.28.4-1",
      "2.28.5-1",
      "2.28.6-1",
      "2.28.7-1",
      "2.28.7-1.1",
      "2.28.7-1.1~exp1",
      "2.28.8-1",
      "3.6.0-1",
      "3.6.0-2",
      "3.6.0-3",
      "3.6.2-1",
      "3.6.2-2",
      "3.6.2-3",
      "3.6.3-1",
      "3.6.4-1",
      "3.6.4-2",
      "3.6.5-0.1",
      "3.6.5-0.1~deb13u1",
      "3.6.6-0.1",
      "3.6.6-0.1~deb13u1",
      "3.6.7-2",
      "3.6.7-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34874.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.6.6-0.1~deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "mbedtls",
      "purl": "pkg:deb/debian/mbedtls?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.6.4-2",
      "3.6.5-0.1",
      "3.6.5-0.1~deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34874.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.6.6-0.1"
          }
        ]
      }
    ],
    "package": {
      "name": "mbedtls",
      "purl": "pkg:deb/debian/mbedtls?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.6.4-2",
      "3.6.5-0.1",
      "3.6.5-0.1~deb13u1",
      "3.6.6-0.1~deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34874.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56833 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-34874 · Revision 1Source updated