ubuntu-cve-2026-39832
Vulnerability from osv_ubuntu
Published
2026-05-22 04:16
Modified
2026-07-21 15:41
Summary
Details

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
8.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
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          {
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          {
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          },
          {
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      "package": {
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      },
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        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "golang-go.crypto",
        "purl": "pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20211202.5770296-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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            {
              "fixed": "1:0.0~git20211202.5770296-1ubuntu0.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.0~git20201221.eec23a3-1",
        "1:0.0~git20211202.5770296-1",
        "1:0.0~git20211202.5770296-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.76+ubuntu24.04.1"
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          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
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          {
            "binary_name": "snap-confine",
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          {
            "binary_name": "ubuntu-core-launcher",
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            "binary_name": "ubuntu-core-snapd-units",
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            "binary_name": "ubuntu-snappy",
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          {
            "binary_name": "ubuntu-snappy-cli",
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
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      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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          ],
          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "2.60.4+23.10",
        "2.61.3+24.04",
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        "2.76+ubuntu24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
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            "binary_version": "1:0.19.0-1ubuntu0.1~esm2"
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      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
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      "ranges": [
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          "type": "ECOSYSTEM"
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      "versions": [
        "1:0.4.0-1",
        "1:0.17.0-1",
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        "1:0.19.0-1",
        "1:0.19.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
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            "binary_version": "1:0.25.0-1ubuntu0.1"
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "golang-go.crypto",
        "purl": "pkg:deb/ubuntu/golang-go.crypto@1:0.25.0-1ubuntu0.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
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          ],
          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "1:0.25.0-1",
        "1:0.25.0-1ubuntu0.1"
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    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.75.2+ubuntu25.10"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.75.2+ubuntu25.10"
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.75.2+ubuntu25.10?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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          ],
          "type": "ECOSYSTEM"
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      "versions": [
        "2.67.1+25.04",
        "2.68.5+ubuntu25.10.2",
        "2.71+ubuntu25.10",
        "2.71.1+ubuntu25.10.1",
        "2.72+ubuntu25.10.2",
        "2.73+ubuntu25.10",
        "2.73+ubuntu25.10.1",
        "2.74.1+ubuntu25.10.4",
        "2.75.2+ubuntu25.10"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.76+ubuntu26.04.3"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.76+ubuntu26.04.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.76+ubuntu26.04.3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.71.1+ubuntu25.10.1",
        "2.72+ubuntu26.04.1",
        "2.73+ubuntu26.04.1",
        "2.74+ubuntu26.04",
        "2.74.1+ubuntu26.04",
        "2.74.1+ubuntu26.04.3",
        "2.74.1+ubuntu26.04.4",
        "2.75.2+ubuntu26.04.2",
        "2.76+ubuntu26.04.2",
        "2.76+ubuntu26.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "golang-golang-x-crypto-dev",
            "binary_version": "1:0.47.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "golang-go.crypto",
        "purl": "pkg:deb/ubuntu/golang-go.crypto@1:0.47.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:0.47.0-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.25.0-1",
        "1:0.45.0-1",
        "1:0.47.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.",
  "id": "UBUNTU-CVE-2026-39832",
  "modified": "2026-07-21T15:41:37Z",
  "published": "2026-05-22T04:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39832"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-39832"
    },
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/79435"
    },
    {
      "type": "REPORT",
      "url": "https://go.dev/cl/778642"
    },
    {
      "type": "REPORT",
      "url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI"
    },
    {
      "type": "REPORT",
      "url": "https://pkg.go.dev/vuln/GO-2026-5006"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/golang/crypto/commit/e3d1254f1e7e60baa086142c46174bf6d8d0fe50"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8447-1"
    }
  ],
  "related": [
    "USN-8447-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-39832"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.