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DEBIAN-CVE-2026-34877

Type: advisorySource: OSV1 source record

An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection of serialized SSL context or session structures allows an attacker who can modify the serialized structures to induce memory corruption, leading to arbitrary code execution. This is caused by Incorrect Use of Privileged APIs.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-34877

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-2026-34877

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

3.6.6-0.1

Source reference: /affected/1/versions

3.6.6-0.1~deb13u1

Source reference: /affected/1/versions

3.6.7-2

Source reference: /affected/1/versions

3.6.7-3

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
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-2026-34877.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "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",
      "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-2026-34877.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "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-2026-34877.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56832 · Revision 1
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Publisher date
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