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usn-8678-3
Vulnerability from osv_ubuntu
Published
2026-08-31 12:18
Modified
2026-09-03 12:42
Summary
openssl vulnerability
Details

USN-8673-1 fixed vulnerabilities in OpenSSL. The update inadvertently left out the fix for CVE-2026-75803 in Ubuntu 26.04 LTS. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that OpenSSL incorrectly handled the QUIC server incoming channel queue. A remote attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-14456)

It was discovered that OpenSSL incorrectly handled signature algorithm selection when using Raw Public Keys. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-14457)

It was discovered that OpenSSL incorrectly handled QUIC INITIAL packet processing. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-18798)

It was discovered that OpenSSL incorrectly handled buffering of DTLS records for a future epoch. A remote attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of service. (CVE-2026-54874)

It was discovered that OpenSSL incorrectly handled CMS key unwrapping. A remote attacker could possibly use this issue to cause a heap buffer overflow, leading to a denial of service or arbitrary code execution. (CVE-2026-63072)

It was discovered that OpenSSL incorrectly validated the sender distinguished name in CMP response messages. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-63073)

It was discovered that OpenSSL incorrectly limited the growth of an internal certificate cache used during CMP operations. A remote attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of service. (CVE-2026-63074)

It was discovered that OpenSSL incorrectly handled QUIC ACK-only packet retention. A remote attacker could possibly use this issue to cause OpenSSL to use excessive resources, leading to a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-63075)

It was discovered that OpenSSL incorrectly handled CMP protection algorithm validation. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-63076)

It was discovered that OpenSSL incorrectly verified authentication tags when using certain AEAD ciphers via the EVP_Cipher() interface. An attacker could possibly use this issue to perform AEAD forgery attacks. (CVE-2026-75803)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-75803",
              "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": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.5-1ubuntu3.5"
          },
          {
            "binary_name": "openssl",
            "binary_version": "3.5.5-1ubuntu3.5"
          },
          {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.5-1ubuntu3.5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "openssl",
        "purl": "pkg:deb/ubuntu/openssl@3.5.5-1ubuntu3.5?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.5-1ubuntu3.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.3-1ubuntu2",
        "3.5.5-1ubuntu1",
        "3.5.5-1ubuntu3",
        "3.5.5-1ubuntu3.2",
        "3.5.5-1ubuntu3.3",
        "3.5.5-1ubuntu3.4"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8673-1 fixed vulnerabilities in OpenSSL. The update inadvertently left\nout the fix for CVE-2026-75803 in Ubuntu 26.04 LTS. This update fixes the\nproblem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that OpenSSL incorrectly handled the QUIC server incoming\n channel queue. A remote attacker could possibly use this issue to cause\n OpenSSL to use excessive resources, leading to a denial of service. This\n issue only affected Ubuntu 26.04 LTS. (CVE-2026-14456)\n\n It was discovered that OpenSSL incorrectly handled signature algorithm\n selection when using Raw Public Keys. A remote attacker could possibly use\n this issue to cause OpenSSL to crash, resulting in a denial of service.\n This issue only affected Ubuntu 26.04 LTS. (CVE-2026-14457)\n\n It was discovered that OpenSSL incorrectly handled QUIC INITIAL packet\n processing. A remote attacker could possibly use this issue to cause\n OpenSSL to crash, resulting in a denial of service. This issue only\n affected Ubuntu 26.04 LTS. (CVE-2026-18798)\n\n It was discovered that OpenSSL incorrectly handled buffering of DTLS\n records for a future epoch. A remote attacker could possibly use this issue\n to cause OpenSSL to use excessive resources, leading to a denial of\n service. (CVE-2026-54874)\n\n It was discovered that OpenSSL incorrectly handled CMS key unwrapping. A\n remote attacker could possibly use this issue to cause a heap buffer\n overflow, leading to a denial of service or arbitrary code execution.\n (CVE-2026-63072)\n\n It was discovered that OpenSSL incorrectly validated the sender\n distinguished name in CMP response messages. A remote attacker could\n possibly use this issue to cause OpenSSL to crash, resulting in a denial of\n service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-63073)\n\n It was discovered that OpenSSL incorrectly limited the growth of an\n internal certificate cache used during CMP operations. A remote attacker\n could possibly use this issue to cause OpenSSL to use excessive resources,\n leading to a denial of service. (CVE-2026-63074)\n\n It was discovered that OpenSSL incorrectly handled QUIC ACK-only packet\n retention. A remote attacker could possibly use this issue to cause OpenSSL\n to use excessive resources, leading to a denial of service. This issue only\n affected Ubuntu 26.04 LTS. (CVE-2026-63075)\n\n It was discovered that OpenSSL incorrectly handled CMP protection algorithm\n validation. A remote attacker could possibly use this issue to cause\n OpenSSL to crash, resulting in a denial of service. (CVE-2026-63076)\n\n It was discovered that OpenSSL incorrectly verified authentication tags\n when using certain AEAD ciphers via the EVP_Cipher() interface. An attacker\n could possibly use this issue to perform AEAD forgery attacks.\n (CVE-2026-75803)",
  "id": "USN-8678-3",
  "modified": "2026-09-03T12:42:24Z",
  "published": "2026-08-31T12:18:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8678-3"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-75803"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "openssl vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-75803"
  ]
}



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