USN-8155-1 (UBUNTU-CVE-2026-2673)

Vulnerability from osv_ubuntu – Published: 2026-04-08 11:57 – Updated: 2026-05-20 14:48 – Source website
VLAI
Summary
openssl vulnerabilities
Details

Viktor Dukhovni discovered that OpenSSL incorrectly negotiated the expected preferred key exchange group when used as a TLS 1.3 server. This could result in a less preferred key exchange being used, contrary to expectations. This issue only affected Ubuntu 25.10. (CVE-2026-2673)

Igor Morgenstern discovered that OpenSSL incorrectly handled certain memory operations when used as a DANE client. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-28387)

Igor Morgenstern discovered that OpenSSL incorrectly handled certain memory operations when processing a delta CRL. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-28388)

Nathan Sportsman, Daniel Rhea, and Jaeho Nam discovered that OpenSSL incorrectly handled certain memory operations when processing a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-28389)

Muhammad Daffa, Joshua Rogers, and Chanho Kim discovered that OpenSSL incorrectly handled processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-28390)

Quoc Tran discovered that OpenSSL incorrectly handled hexadecimal conversion on 32-bit platforms. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-31789)

Simo Sorce discovered that OpenSSL incorrectly handled failures in RSA KEM RSASVE Encapsulation. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-31790)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-28387",
              "severity": [
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      ]
    },
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              "id": "CVE-2026-28387",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
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              "id": "CVE-2026-28388",
              "severity": [
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
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                  "type": "Ubuntu"
                }
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            {
              "id": "CVE-2026-28389",
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                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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            "binary_name": "libssl3t64",
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          },
          {
            "binary_name": "openssl",
            "binary_version": "3.0.13-0ubuntu3.9"
          }
        ]
      },
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      },
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        "3.0.10-1ubuntu2.1",
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        "3.0.13-0ubuntu3.7"
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    },
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                  "type": "CVSS_V3"
                },
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                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-28389",
              "severity": [
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-28390",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-31789",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-31790",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:25.10"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.3-1ubuntu3.3"
          },
          {
            "binary_name": "openssl",
            "binary_version": "3.5.3-1ubuntu3.3"
          },
          {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.3-1ubuntu3.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@3.5.3-1ubuntu3.3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.3-1ubuntu3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.1-1ubuntu3",
        "3.5.0-2ubuntu1",
        "3.5.2-1ubuntu1",
        "3.5.3-1ubuntu2",
        "3.5.3-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "Viktor Dukhovni discovered that OpenSSL incorrectly negotiated the expected\npreferred key exchange group when used as a TLS 1.3 server. This could\nresult in a less preferred key exchange being used, contrary to\nexpectations. This issue only affected Ubuntu 25.10. (CVE-2026-2673)\n\nIgor Morgenstern discovered that OpenSSL incorrectly handled certain memory\noperations when used as a DANE client. A remote attacker could use this\nissue to cause OpenSSL to crash, resulting in a denial of service, or\npossibly execute arbitrary code. (CVE-2026-28387)\n\nIgor Morgenstern discovered that OpenSSL incorrectly handled certain memory\noperations when processing a delta CRL. A remote attacker could possibly\nuse this issue to cause OpenSSL to crash, resulting in a denial of service.\n(CVE-2026-28388)\n\nNathan Sportsman, Daniel Rhea, and Jaeho Nam discovered that OpenSSL\nincorrectly handled certain memory operations when processing a crafted CMS\nEnvelopedData message with KeyAgreeRecipientInfo. A remote attacker could\npossibly use this issue to cause OpenSSL to crash, resulting in a denial\nof service. (CVE-2026-28389)\n\nMuhammad Daffa, Joshua Rogers, and Chanho Kim discovered that OpenSSL\nincorrectly handled processing of a crafted CMS EnvelopedData message with\nKeyTransportRecipientInfo. A remote attacker could possibly use this issue\nto cause OpenSSL to crash, resulting in a denial of service.\n(CVE-2026-28390)\n\nQuoc Tran discovered that OpenSSL incorrectly handled hexadecimal\nconversion on 32-bit platforms. A remote attacker could use this issue to\ncause OpenSSL to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2026-31789)\n\nSimo Sorce discovered that OpenSSL incorrectly handled failures in RSA KEM\nRSASVE Encapsulation. A remote attacker could possibly use this issue to\nobtain sensitive information. (CVE-2026-31790)",
  "id": "USN-8155-1",
  "modified": "2026-05-20T14:48:17Z",
  "published": "2026-04-08T11:57:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8155-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-2673"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-28387"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-28388"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-28389"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-28390"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31789"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31790"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssl vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-2673",
    "UBUNTU-CVE-2026-28387",
    "UBUNTU-CVE-2026-28388",
    "UBUNTU-CVE-2026-28389",
    "UBUNTU-CVE-2026-28390",
    "UBUNTU-CVE-2026-31789",
    "UBUNTU-CVE-2026-31790"
  ]
}



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