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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 

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                {
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            {
              "id": "CVE-2026-28388",
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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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              ]
            },
            {
              "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",
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                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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                },
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                  "score": "low",
                  "type": "Ubuntu"
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              ]
            },
            {
              "id": "CVE-2026-28390",
              "severity": [
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                  "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",
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              ]
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          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
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        "binaries": [
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      "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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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.