USN-8955-2 (UBUNTU-CVE-2026-15176)

Vulnerability from osv_ubuntu – Published: 2026-11-05 14:40 – Updated: 2026-11-05 14:40 – Source website
VLAI
Summary
nginx vulnerabilities
Details

USN-8955-1 fixed vulnerabilities in nginx in Ubuntu 26.10, Ubuntu 26.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 22.04 LTS. This update provides the corresponding update for Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 14.04 LTS.

In addition, this update fixes CVE-2026-42533 for these releases.

It was discovered that nginx incorrectly handled certain map directives using regex matching and capture variables. A remote attacker could possibly use this issue to crash nginx, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-42533)

Original advisory 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
To clipboard 

{
  "affected": [
    {
      "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-2026-42533",
              "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-2026-97205",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "nginx",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-common",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-core",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-extras",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-full",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-light",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-naxsi",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          },
          {
            "binary_name": "nginx-naxsi-ui",
            "binary_version": "1.4.6-1ubuntu3.9+esm9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "nginx",
        "purl": "pkg:deb/ubuntu/nginx@1.4.6-1ubuntu3.9+esm9?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.6-1ubuntu3.9+esm9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.1-3ubuntu1",
        "1.4.3-2ubuntu1",
        "1.4.4-1ubuntu1",
        "1.4.4-2ubuntu1",
        "1.4.4-4ubuntu1",
        "1.4.5-1ubuntu1",
        "1.4.6-1ubuntu2",
        "1.4.6-1ubuntu3",
        "1.4.6-1ubuntu3.1",
        "1.4.6-1ubuntu3.2",
        "1.4.6-1ubuntu3.3",
        "1.4.6-1ubuntu3.4",
        "1.4.6-1ubuntu3.5",
        "1.4.6-1ubuntu3.6",
        "1.4.6-1ubuntu3.7",
        "1.4.6-1ubuntu3.8",
        "1.4.6-1ubuntu3.9",
        "1.4.6-1ubuntu3.9+esm1",
        "1.4.6-1ubuntu3.9+esm2",
        "1.4.6-1ubuntu3.9+esm3",
        "1.4.6-1ubuntu3.9+esm4",
        "1.4.6-1ubuntu3.9+esm5",
        "1.4.6-1ubuntu3.9+esm6",
        "1.4.6-1ubuntu3.9+esm8"
      ]
    },
    {
      "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-2026-42533",
              "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-2026-97205",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "nginx",
            "binary_version": "1.10.3-0ubuntu0.16.04.5+esm10"
          },
          {
            "binary_name": "nginx-common",
            "binary_version": "1.10.3-0ubuntu0.16.04.5+esm10"
          },
          {
            "binary_name": "nginx-core",
            "binary_version": "1.10.3-0ubuntu0.16.04.5+esm10"
          },
          {
            "binary_name": "nginx-extras",
            "binary_version": "1.10.3-0ubuntu0.16.04.5+esm10"
          },
          {
            "binary_name": "nginx-full",
            "binary_version": "1.10.3-0ubuntu0.16.04.5+esm10"
          },
          {
            "binary_name": "nginx-light",
            "binary_version": "1.10.3-0ubuntu0.16.04.5+esm10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "nginx",
        "purl": "pkg:deb/ubuntu/nginx@1.10.3-0ubuntu0.16.04.5+esm10?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.10.3-0ubuntu0.16.04.5+esm10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.3-1ubuntu1",
        "1.9.6-2ubuntu1",
        "1.9.6-2ubuntu2",
        "1.9.9-0ubuntu1",
        "1.9.9-1ubuntu1",
        "1.9.10-0ubuntu1",
        "1.9.10-1ubuntu1",
        "1.9.11-0ubuntu1",
        "1.9.11-0ubuntu2",
        "1.9.12-0ubuntu1",
        "1.9.13-0ubuntu1",
        "1.9.14-0ubuntu1",
        "1.9.15-0ubuntu1",
        "1.10.0-0ubuntu0.16.04.1",
        "1.10.0-0ubuntu0.16.04.2",
        "1.10.0-0ubuntu0.16.04.3",
        "1.10.0-0ubuntu0.16.04.4",
        "1.10.3-0ubuntu0.16.04.1",
        "1.10.3-0ubuntu0.16.04.2",
        "1.10.3-0ubuntu0.16.04.3",
        "1.10.3-0ubuntu0.16.04.4",
        "1.10.3-0ubuntu0.16.04.5",
        "1.10.3-0ubuntu0.16.04.5+esm1",
        "1.10.3-0ubuntu0.16.04.5+esm2",
        "1.10.3-0ubuntu0.16.04.5+esm3",
        "1.10.3-0ubuntu0.16.04.5+esm4",
        "1.10.3-0ubuntu0.16.04.5+esm5",
        "1.10.3-0ubuntu0.16.04.5+esm6",
        "1.10.3-0ubuntu0.16.04.5+esm7",
        "1.10.3-0ubuntu0.16.04.5+esm9"
      ]
    },
    {
      "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-2026-42533",
              "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-2026-97205",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnginx-mod-http-auth-pam",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-cache-purge",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-dav-ext",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-echo",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-fancyindex",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-geoip",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-headers-more-filter",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-image-filter",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-lua",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-ndk",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-perl",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-subs-filter",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-uploadprogress",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-upstream-fair",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-http-xslt-filter",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-mail",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-nchan",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-rtmp",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "libnginx-mod-stream",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "nginx",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "nginx-common",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "nginx-core",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "nginx-extras",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "nginx-full",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          },
          {
            "binary_name": "nginx-light",
            "binary_version": "1.14.0-0ubuntu1.11+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "nginx",
        "purl": "pkg:deb/ubuntu/nginx@1.14.0-0ubuntu1.11+esm5?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.14.0-0ubuntu1.11+esm5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.12.1-0ubuntu2",
        "1.13.6-2ubuntu1",
        "1.13.6-2ubuntu2",
        "1.13.10-1ubuntu1",
        "1.13.12-0ubuntu1",
        "1.14.0-0ubuntu1",
        "1.14.0-0ubuntu1.1",
        "1.14.0-0ubuntu1.2",
        "1.14.0-0ubuntu1.3",
        "1.14.0-0ubuntu1.4",
        "1.14.0-0ubuntu1.5",
        "1.14.0-0ubuntu1.6",
        "1.14.0-0ubuntu1.7",
        "1.14.0-0ubuntu1.9",
        "1.14.0-0ubuntu1.10",
        "1.14.0-0ubuntu1.11",
        "1.14.0-0ubuntu1.11+esm1",
        "1.14.0-0ubuntu1.11+esm2",
        "1.14.0-0ubuntu1.11+esm4"
      ]
    },
    {
      "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-2026-42533",
              "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-2026-97205",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnginx-mod-http-auth-pam",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-cache-purge",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-dav-ext",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-echo",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-fancyindex",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-geoip",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-geoip2",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-headers-more-filter",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-image-filter",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-lua",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-ndk",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-perl",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-subs-filter",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-uploadprogress",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-upstream-fair",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-http-xslt-filter",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-mail",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-nchan",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-rtmp",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "libnginx-mod-stream",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "nginx",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "nginx-common",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "nginx-core",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "nginx-extras",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "nginx-full",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          },
          {
            "binary_name": "nginx-light",
            "binary_version": "1.18.0-0ubuntu1.7+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "nginx",
        "purl": "pkg:deb/ubuntu/nginx@1.18.0-0ubuntu1.7+esm4?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.0-0ubuntu1.7+esm4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.16.1-0ubuntu2",
        "1.16.1-0ubuntu3",
        "1.17.5-0ubuntu1",
        "1.17.6-0ubuntu1",
        "1.17.7-0ubuntu1",
        "1.17.8-0ubuntu1",
        "1.17.8-0ubuntu2",
        "1.17.8-0ubuntu3",
        "1.17.9-0ubuntu1",
        "1.17.9-0ubuntu2",
        "1.17.9-0ubuntu3",
        "1.17.10-0ubuntu1",
        "1.18.0-0ubuntu1",
        "1.18.0-0ubuntu1.2",
        "1.18.0-0ubuntu1.3",
        "1.18.0-0ubuntu1.4",
        "1.18.0-0ubuntu1.5",
        "1.18.0-0ubuntu1.6",
        "1.18.0-0ubuntu1.7",
        "1.18.0-0ubuntu1.7+esm1",
        "1.18.0-0ubuntu1.7+esm3"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8955-1 fixed vulnerabilities in nginx in Ubuntu 26.10, Ubuntu 26.04\nLTS, Ubuntu 24.04 LTS, and Ubuntu 22.04 LTS. This update provides the\ncorresponding update for Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, Ubuntu 16.04\nLTS, and Ubuntu 14.04 LTS.\n\nIn addition, this update fixes CVE-2026-42533 for these releases.\n\nIt was discovered that nginx incorrectly handled certain map directives\nusing regex matching and capture variables. A remote attacker could\npossibly use this issue to crash nginx, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2026-42533)\n\nOriginal advisory details:\n\n 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.  (CVE-2026-15176)\n\n It 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  of\nservice, or execute arbitrary code.  (CVE-2026-93479)\n\n It was discovered that nginx incorrectly handled HTTP/3 requests when\nproxy_request_buffering was enabled. This issue only affected  Ubuntu 26.04\nLTS and Ubuntu 26.10. A remote attacker could possibly use  this issue to\ninject data into proxied requests.  (CVE-2026-95101)\n\n It was discovered that nginx incorrectly handled asynchronous file I/O  in\ncertain configurations with Server Side Includes pages. A remote  attacker\ncould possibly use this issue to cause nginx to crash,  resulting in a\ndenial of service, or execute arbitrary code.  (CVE-2026-97205)\n\n It 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  could possibly use this issue to forge\nclient SSL sessions and bypass  client certificate verification.\n(CVE-2026-97629)",
  "id": "USN-8955-2",
  "modified": "2026-11-05T14:40:26Z",
  "published": "2026-11-05T14:40:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8955-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15176"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42533"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-93479"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-97205"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "nginx vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-15176",
    "UBUNTU-CVE-2026-42533",
    "UBUNTU-CVE-2026-93479",
    "UBUNTU-CVE-2026-97205"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    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.