usn-8155-2
Vulnerability from osv_ubuntu
Published
2026-04-09 17:35
Modified
2026-06-25 10:47
Summary
openssl, openssl1.0 vulnerabilities
Details

USN-8155-1 fixed vulnerabilities in OpenSSL. This update provides the corresponding updates for CVE-2026-28387 for openssl in Ubuntu 20.04 LTS. CVE-2026-28388 for openssl and openssl1.0 in Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS, and CVE-2026-28389 and CVE-2026-28390 for openssl and openssl1.0 for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory 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": {
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            {
              "id": "CVE-2026-28388",
              "severity": [
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        }
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                  "type": "CVSS_V3"
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        ]
      },
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        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.20+esm15?arch=source\u0026distro=esm-infra/xenial"
      },
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        "1.0.2g-1ubuntu4.15",
        "1.0.2g-1ubuntu4.16",
        "1.0.2g-1ubuntu4.17",
        "1.0.2g-1ubuntu4.18",
        "1.0.2g-1ubuntu4.19",
        "1.0.2g-1ubuntu4.20",
        "1.0.2g-1ubuntu4.20+esm1",
        "1.0.2g-1ubuntu4.20+esm2",
        "1.0.2g-1ubuntu4.20+esm3",
        "1.0.2g-1ubuntu4.20+esm4",
        "1.0.2g-1ubuntu4.20+esm5",
        "1.0.2g-1ubuntu4.20+esm6",
        "1.0.2g-1ubuntu4.20+esm7",
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        "1.0.2g-1ubuntu4.20+esm11",
        "1.0.2g-1ubuntu4.20+esm12",
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                  "type": "CVSS_V3"
                },
                {
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            {
              "id": "CVE-2026-28388",
              "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"
                },
                {
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                  "type": "Ubuntu"
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              "id": "CVE-2026-28389",
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                  "type": "CVSS_V3"
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                {
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          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
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        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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        "1.1.1-1ubuntu2.1~18.04.8",
        "1.1.1-1ubuntu2.1~18.04.9",
        "1.1.1-1ubuntu2.1~18.04.10",
        "1.1.1-1ubuntu2.1~18.04.13",
        "1.1.1-1ubuntu2.1~18.04.14",
        "1.1.1-1ubuntu2.1~18.04.15",
        "1.1.1-1ubuntu2.1~18.04.17",
        "1.1.1-1ubuntu2.1~18.04.19",
        "1.1.1-1ubuntu2.1~18.04.20",
        "1.1.1-1ubuntu2.1~18.04.21",
        "1.1.1-1ubuntu2.1~18.04.22",
        "1.1.1-1ubuntu2.1~18.04.23",
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        "1.1.1-1ubuntu2.1~18.04.23+esm4",
        "1.1.1-1ubuntu2.1~18.04.23+esm5",
        "1.1.1-1ubuntu2.1~18.04.23+esm6",
        "1.1.1-1ubuntu2.1~18.04.23+esm7"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
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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"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-28388",
              "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-2026-28389",
              "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-2026-28390",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
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        "binaries": [
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        "name": "openssl1.0",
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      "versions": [
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        "1.0.2n-1ubuntu5",
        "1.0.2n-1ubuntu5.1",
        "1.0.2n-1ubuntu5.2",
        "1.0.2n-1ubuntu5.3",
        "1.0.2n-1ubuntu5.4",
        "1.0.2n-1ubuntu5.5",
        "1.0.2n-1ubuntu5.6",
        "1.0.2n-1ubuntu5.7",
        "1.0.2n-1ubuntu5.8",
        "1.0.2n-1ubuntu5.9",
        "1.0.2n-1ubuntu5.10",
        "1.0.2n-1ubuntu5.11",
        "1.0.2n-1ubuntu5.12",
        "1.0.2n-1ubuntu5.13",
        "1.0.2n-1ubuntu5.13+esm1",
        "1.0.2n-1ubuntu5.13+esm2",
        "1.0.2n-1ubuntu5.13+esm3"
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    },
    {
      "database_specific": {
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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"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-28388",
              "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-2026-28389",
              "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-2026-28390",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libssl1.1",
            "binary_version": "1.1.1f-1ubuntu2.24+esm3"
          },
          {
            "binary_name": "openssl",
            "binary_version": "1.1.1f-1ubuntu2.24+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@1.1.1f-1ubuntu2.24+esm3?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.1f-1ubuntu2.24+esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.1c-1ubuntu4",
        "1.1.1d-2ubuntu3",
        "1.1.1d-2ubuntu6",
        "1.1.1f-1ubuntu1",
        "1.1.1f-1ubuntu2",
        "1.1.1f-1ubuntu2.1",
        "1.1.1f-1ubuntu2.2",
        "1.1.1f-1ubuntu2.3",
        "1.1.1f-1ubuntu2.4",
        "1.1.1f-1ubuntu2.5",
        "1.1.1f-1ubuntu2.8",
        "1.1.1f-1ubuntu2.9",
        "1.1.1f-1ubuntu2.10",
        "1.1.1f-1ubuntu2.11",
        "1.1.1f-1ubuntu2.12",
        "1.1.1f-1ubuntu2.13",
        "1.1.1f-1ubuntu2.15",
        "1.1.1f-1ubuntu2.16",
        "1.1.1f-1ubuntu2.17",
        "1.1.1f-1ubuntu2.18",
        "1.1.1f-1ubuntu2.19",
        "1.1.1f-1ubuntu2.20",
        "1.1.1f-1ubuntu2.21",
        "1.1.1f-1ubuntu2.22",
        "1.1.1f-1ubuntu2.23",
        "1.1.1f-1ubuntu2.24",
        "1.1.1f-1ubuntu2.24+esm1",
        "1.1.1f-1ubuntu2.24+esm2"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8155-1 fixed vulnerabilities in OpenSSL. This update provides the\ncorresponding updates for CVE-2026-28387 for openssl in Ubuntu 20.04 LTS.\nCVE-2026-28388 for openssl and openssl1.0 in Ubuntu 14.04 LTS, Ubuntu 16.04\nLTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS, and CVE-2026-28389 and\nCVE-2026-28390 for openssl and openssl1.0 for Ubuntu 16.04 LTS, Ubuntu\n18.04 LTS, and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n Viktor Dukhovni discovered that OpenSSL incorrectly negotiated the\n expected preferred key exchange group when used as a TLS 1.3 server. This\n could result in a less preferred key exchange being used, contrary to\n expectations. This issue only affected Ubuntu 25.10. (CVE-2026-2673)\n\n Igor Morgenstern discovered that OpenSSL incorrectly handled certain\n memory operations when used as a DANE client. A remote attacker could use\n this issue to cause OpenSSL to crash, resulting in a denial of service, or\n possibly execute arbitrary code. (CVE-2026-28387)\n\n Igor Morgenstern discovered that OpenSSL incorrectly handled certain\n memory operations when processing a delta CRL. A remote attacker could\n possibly use this issue to cause OpenSSL to crash, resulting in a denial\n of service. (CVE-2026-28388)\n\n Nathan Sportsman, Daniel Rhea, and Jaeho Nam discovered that OpenSSL\n incorrectly handled certain memory operations when processing a crafted\n CMS EnvelopedData message with KeyAgreeRecipientInfo. A remote attacker\n could possibly use this issue to cause OpenSSL to crash, resulting in a\n denial of service. (CVE-2026-28389)\n\n Muhammad Daffa, Joshua Rogers, and Chanho Kim discovered that OpenSSL\n incorrectly handled processing of a crafted CMS EnvelopedData message with\n KeyTransportRecipientInfo. A remote attacker could possibly use this issue\n to cause OpenSSL to crash, resulting in a denial of service.\n (CVE-2026-28390)\n\n Quoc Tran discovered that OpenSSL incorrectly handled hexadecimal\n conversion on 32-bit platforms. A remote attacker could use this issue to\n cause OpenSSL to crash, resulting in a denial of service, or possibly\n execute arbitrary code. (CVE-2026-31789)\n\n Simo Sorce discovered that OpenSSL incorrectly handled failures in RSA KEM\n RSASVE Encapsulation. A remote attacker could possibly use this issue to\n obtain sensitive information. (CVE-2026-31790)",
  "id": "USN-8155-2",
  "modified": "2026-06-25T10:47:36Z",
  "published": "2026-04-09T17:35:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8155-2"
    },
    {
      "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"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssl, openssl1.0 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-28387",
    "UBUNTU-CVE-2026-28388",
    "UBUNTU-CVE-2026-28389",
    "UBUNTU-CVE-2026-28390"
  ]
}



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Taxonomy of the tags.





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.