USN-8955-1 (UBUNTU-CVE-2026-15176)

Vulnerability from osv_ubuntu – Published: 2026-10-26 15:34 – Updated: 2026-10-26 15:34 – Source website
VLAI
Summary
nginx vulnerabilities
Details

It was discovered that nginx incorrectly handled certain configurations using the alias directive together with rewrite rules. A remote attacker could possibly use this issue to cause nginx to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-15176)

It was discovered that nginx incorrectly handled map directives using regex matching under certain circumstances. A remote attacker could possibly use this issue to cause nginx to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-93479)

It was discovered that nginx incorrectly handled HTTP/3 requests when proxy_request_buffering was enabled. This issue only affected Ubuntu 26.04 LTS and Ubuntu 26.10. A remote attacker could possibly use this issue to inject data into proxied requests. (CVE-2026-95101)

It was discovered that nginx incorrectly handled asynchronous file I/O in certain configurations with Server Side Includes pages. A remote attacker could possibly use this issue to cause nginx to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-97205)

It was discovered that nginx incorrectly handled SSL session ticket keys when configured with a shared session cache but without explicit ticket key rotation. This issue only affected Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. A remote attacker could possibly use this issue to forge client SSL sessions and bypass client certificate verification. (CVE-2026-97629)

References
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{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
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              "id": "CVE-2026-15176",
              "severity": [
                {
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            },
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                  "type": "CVSS_V3"
                },
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                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
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                  "score": "medium",
                  "type": "Ubuntu"
                }
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              "id": "CVE-2026-93479",
              "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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                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
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              "id": "CVE-2026-97205",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-97629",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
                  "type": "CVSS_V3"
                },
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                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
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                }
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            {
              "id": "CVE-2026-15176",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-93479",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-95101",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-97205",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-97629",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
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                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
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        }
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    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-15176",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-93479",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-95101",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-97205",
              "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-97629",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
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                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnginx-mod-http-geoip",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "libnginx-mod-http-image-filter",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "libnginx-mod-http-perl",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "libnginx-mod-http-xslt-filter",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "libnginx-mod-mail",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "libnginx-mod-stream",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "libnginx-mod-stream-geoip",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "nginx",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "nginx-common",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "nginx-core",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "nginx-extras",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "nginx-full",
            "binary_version": "1.28.3-2ubuntu1.12"
          },
          {
            "binary_name": "nginx-light",
            "binary_version": "1.28.3-2ubuntu1.12"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nginx",
        "purl": "pkg:deb/ubuntu/nginx@1.28.3-2ubuntu1.12?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.28.3-2ubuntu1.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.28.0-6ubuntu1",
        "1.28.1-2ubuntu1",
        "1.28.1-3ubuntu1",
        "1.28.2-2ubuntu1",
        "1.28.3-2ubuntu1",
        "1.28.3-2ubuntu1.1",
        "1.28.3-2ubuntu1.2",
        "1.28.3-2ubuntu1.3",
        "1.28.3-2ubuntu1.4",
        "1.28.3-2ubuntu1.5",
        "1.28.3-2ubuntu1.6",
        "1.28.3-2ubuntu1.7",
        "1.28.3-2ubuntu1.8",
        "1.28.3-2ubuntu1.9",
        "1.28.3-2ubuntu1.10",
        "1.28.3-2ubuntu1.11"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that nginx incorrectly handled certain configurations\nusing the alias directive together with rewrite rules. A remote attacker\ncould possibly use this issue to cause nginx to crash, resulting in a\ndenial of service, or execute arbitrary code.\n(CVE-2026-15176)\n\nIt was discovered that nginx incorrectly handled map directives using\nregex matching under certain circumstances. A remote attacker could\npossibly use this issue to cause nginx to crash, resulting in a denial\nof service, or execute arbitrary code.\n(CVE-2026-93479)\n\nIt was discovered that nginx incorrectly handled HTTP/3 requests when\nproxy_request_buffering was enabled. This issue only affected\nUbuntu 26.04 LTS and Ubuntu 26.10. A remote attacker could possibly use\nthis issue to inject data into proxied requests.\n(CVE-2026-95101)\n\nIt was discovered that nginx incorrectly handled asynchronous file I/O\nin certain configurations with Server Side Includes pages. A remote\nattacker could possibly use this issue to cause nginx to crash,\nresulting in a denial of service, or execute arbitrary code.\n(CVE-2026-97205)\n\nIt was discovered that nginx incorrectly handled SSL session ticket keys\nwhen configured with a shared session cache but without explicit ticket\nkey rotation. This issue only affected Ubuntu 24.04 LTS, Ubuntu 26.04 LTS,\nand Ubuntu 26.10. A remote attacker\ncould possibly use this issue to forge client SSL sessions and bypass\nclient certificate verification.\n(CVE-2026-97629)",
  "id": "USN-8955-1",
  "modified": "2026-10-26T15:34:05Z",
  "published": "2026-10-26T15:34:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8955-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15176"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-93479"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-95101"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-97205"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-97629"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "nginx vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-15176",
    "UBUNTU-CVE-2026-93479",
    "UBUNTU-CVE-2026-95101",
    "UBUNTU-CVE-2026-97205",
    "UBUNTU-CVE-2026-97629"
  ]
}



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