ubuntu-cve-2026-1858
Vulnerability from osv_ubuntu
Published
2026-04-29 21:16
Modified
2026-05-20 15:24
Summary
Details

wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.

Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwget0",
            "binary_version": "0.0.20170806-1"
          },
          {
            "binary_name": "wget2",
            "binary_version": "0.0.20170806-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "wget2",
        "purl": "pkg:deb/ubuntu/wget2@0.0.20170806-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.20170806-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwget0",
            "binary_version": "1.99.1-2.1"
          },
          {
            "binary_name": "wget2",
            "binary_version": "1.99.1-2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "wget2",
        "purl": "pkg:deb/ubuntu/wget2@1.99.1-2.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.99.1-2",
        "1.99.1-2.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwget0",
            "binary_version": "1.99.1-2.2"
          },
          {
            "binary_name": "wget2",
            "binary_version": "1.99.1-2.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "wget2",
        "purl": "pkg:deb/ubuntu/wget2@1.99.1-2.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.99.1-2.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwget2t64",
            "binary_version": "2.1.0-2.1build2"
          },
          {
            "binary_name": "wget2",
            "binary_version": "2.1.0-2.1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "wget2",
        "purl": "pkg:deb/ubuntu/wget2@2.1.0-2.1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.99.1-2.2",
        "2.1.0-2",
        "2.1.0-2.1build1",
        "2.1.0-2.1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwget3",
            "binary_version": "2.2.0+ds-1"
          },
          {
            "binary_name": "wget2",
            "binary_version": "2.2.0+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "wget2",
        "purl": "pkg:deb/ubuntu/wget2@2.2.0+ds-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.0+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libwget3",
            "binary_version": "2.2.0+ds-3build1"
          },
          {
            "binary_name": "wget2",
            "binary_version": "2.2.0+ds-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "wget2",
        "purl": "pkg:deb/ubuntu/wget2@2.2.0+ds-3build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.0+ds-1",
        "2.2.0+ds-2",
        "2.2.0+ds-3",
        "2.2.0+ds-3build1"
      ]
    }
  ],
  "aliases": [],
  "details": "wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.",
  "id": "UBUNTU-CVE-2026-1858",
  "modified": "2026-05-20T15:24:27Z",
  "published": "2026-04-29T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-1858"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-1858"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-1858"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.