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DEBIAN-CVE-2026-6409

Type: advisorySource: OSV1 source record

A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-6409

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-2026-6409

protobuf

Source reference: /affected/0/package/name

Affected versions
3.21.12-3

Source reference: /affected/0/versions

Fixed versions
3.21.12-3+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

protobuf

Source reference: /affected/1/package/name

Affected versions
3.21.12-11

Source reference: /affected/1/versions

Fixed versions
3.21.12-11+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

protobuf

Source reference: /affected/2/package/name

Affected versions
3.21.12-11

Source reference: /affected/2/versions

3.21.12-12

Source reference: /affected/2/versions

3.21.12-13

Source reference: /affected/2/versions

3.21.12-14

Source reference: /affected/2/versions

3.21.12-15

Source reference: /affected/2/versions

Fixed versions
3.21.12-16

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"
          },
          {
            "fixed": "3.21.12-3+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "protobuf",
      "purl": "pkg:deb/debian/protobuf?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.21.12-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6409.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.21.12-11+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "protobuf",
      "purl": "pkg:deb/debian/protobuf?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.21.12-11"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6409.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.21.12-16"
          }
        ]
      }
    ],
    "package": {
      "name": "protobuf",
      "purl": "pkg:deb/debian/protobuf?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.21.12-11",
      "3.21.12-12",
      "3.21.12-13",
      "3.21.12-14",
      "3.21.12-15"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6409.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#58227 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-6409 · Revision 1Source updated