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DEBIAN-CVE-2026-3706

Type: advisorySource: OSV1 source record

A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The actual existence of this vulnerability is currently in question. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch. The project maintainer explains: "Signature Malleability is not exploitable in SSH protocol. (...) [A] PoC doesn't exist for SSH implementation, but rather it's against the internal API."

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-3706

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-2026-3706

dropbear

Source reference: /affected/0/package/name

Affected versions
2022.83-1

Source reference: /affected/0/versions

2022.83-1+deb12u1

Source reference: /affected/0/versions

2022.83-1+deb12u1~bpo11+1

Source reference: /affected/0/versions

2022.83-1+deb12u2

Source reference: /affected/0/versions

2022.83-1+deb12u3

Source reference: /affected/0/versions

2022.83-2

Source reference: /affected/0/versions

2022.83-3

Source reference: /affected/0/versions

2022.83-4

Source reference: /affected/0/versions

2024.84-1

Source reference: /affected/0/versions

2024.85-1

Source reference: /affected/0/versions

2024.85-2

Source reference: /affected/0/versions

2024.85-3

Source reference: /affected/0/versions

2024.86-1

Source reference: /affected/0/versions

2024.86-2

Source reference: /affected/0/versions

2025.87-1

Source reference: /affected/0/versions

2025.88-1

Source reference: /affected/0/versions

2025.88-2

Source reference: /affected/0/versions

2025.89-1

Source reference: /affected/0/versions

2025.89-1~deb13u1

Source reference: /affected/0/versions

2026.90-1

Source reference: /affected/0/versions

2026.91-1

Source reference: /affected/0/versions

2026.92-1

Source reference: /affected/0/versions

2026.93-1

Source reference: /affected/0/versions

2026.94-1

Source reference: /affected/0/versions

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

dropbear

Source reference: /affected/1/package/name

Affected versions
2025.88-2

Source reference: /affected/1/versions

2025.89-1

Source reference: /affected/1/versions

2025.89-1~deb13u1

Source reference: /affected/1/versions

2026.90-1

Source reference: /affected/1/versions

2026.91-1

Source reference: /affected/1/versions

2026.92-1

Source reference: /affected/1/versions

2026.93-1

Source reference: /affected/1/versions

2026.94-1

Source reference: /affected/1/versions

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

dropbear

Source reference: /affected/2/package/name

Affected versions
2025.88-2

Source reference: /affected/2/versions

2025.89-1

Source reference: /affected/2/versions

2025.89-1~deb13u1

Source reference: /affected/2/versions

Fixed versions
2026.90-1

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": "dropbear",
      "purl": "pkg:deb/debian/dropbear?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2022.83-1",
      "2022.83-1+deb12u1",
      "2022.83-1+deb12u1~bpo11+1",
      "2022.83-1+deb12u2",
      "2022.83-1+deb12u3",
      "2022.83-2",
      "2022.83-3",
      "2022.83-4",
      "2024.84-1",
      "2024.85-1",
      "2024.85-2",
      "2024.85-3",
      "2024.86-1",
      "2024.86-2",
      "2025.87-1",
      "2025.88-1",
      "2025.88-2",
      "2025.89-1",
      "2025.89-1~deb13u1",
      "2026.90-1",
      "2026.91-1",
      "2026.92-1",
      "2026.93-1",
      "2026.94-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3706.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "dropbear",
      "purl": "pkg:deb/debian/dropbear?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2025.88-2",
      "2025.89-1",
      "2025.89-1~deb13u1",
      "2026.90-1",
      "2026.91-1",
      "2026.92-1",
      "2026.93-1",
      "2026.94-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3706.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2026.90-1"
          }
        ]
      }
    ],
    "package": {
      "name": "dropbear",
      "purl": "pkg:deb/debian/dropbear?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2025.88-2",
      "2025.89-1",
      "2025.89-1~deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3706.json"
    },
    "ecosystem_specific": {
      "urgency": "unimportant"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#55995 · Revision 1
Added to Heist Feed
Publisher date
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