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  "document": {
    "aggregate_severity": {
      "text": "Critical"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: heap buffer overflow when a \"rewrite\" changed the URI\n     in a location using \"alias\" and the URI was mapped to a path before a\n     new location was selected, for example through $request_filename in\n     \"return\", \"set\", \"if\", \"add_header\" or an access log format\n     - debian/patches/CVE-2026-15176.patch: also reject URI to path mapping\n       with \"alias\" when the r->uri_changed flag is set, in\n       ngx_http_map_uri_to_path() of src/http/ngx_http_core_module.c\n     - CVE-2026-15176\n   * SECURITY UPDATE: heap buffer overflow when a string expression with\n     variables produced more data in the copy pass than the length pass\n     predicted, for example map regex captures or non-cacheable variables in\n     \"root\", \"alias\" or an \"access_log\" path, because the copy could spill\n     into the caller's reserved area and the recalculated length then\n     exceeded the allocated buffer\n     - debian/patches/CVE-2026-93479.patch: exclude the reserved area from the\n       copy bound and allocate it on top of the computed length, in\n       ngx_http_script_run() of src/http/ngx_http_script.c and\n       ngx_stream_script_run() of src/stream/ngx_stream_script.c\n     - CVE-2026-93479\n   * SECURITY UPDATE: use-after-free when 256 or more asynchronous operations\n     were pending on one request, for example AIO reads from many SSI\n     \"include virtual\" subrequests, which wrapped the 8-bit r->main->blocked\n     counter so the request could be freed while those operations still\n     referenced its pool\n     - debian/patches/CVE-2026-97205.patch: limit pending operations per\n       request to NGX_HTTP_MAX_BLOCKED and perform further operations\n       synchronously or refuse them, in ngx_http_copy_filter() of\n       src/http/ngx_http_copy_filter_module.c, ngx_http_file_cache_lock() and\n       ngx_http_file_cache_aio_read() of src/http/ngx_http_file_cache.c and\n       ngx_http_upstream_thread_handler() of src/http/ngx_http_upstream.c,\n       with the limit defined in src/http/ngx_http_request.h; also include\n       the upstream fixes for request termination with AIO in subrequests\n       (r->main->terminated, src/http/ngx_http_request.c) and for the use of\n       closed upstream sockets with filter finalization\n       (src/event/ngx_event_pipe.c), which the refusal path relies on\n     - CVE-2026-97205\n   * Fix worker crashes in third-party modules that reuse the complex value\n     script code, such as ngx_devel_kit based set-misc directives\n     - debian/patches/CVE-2026-42533.patch: include the upstream follow-up\n       that restores the stack update in ngx_http_script_complex_value_code()\n       of src/http/ngx_http_script.c",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els-docker/releases/CLSA-2026:1793099322",
        "url": "https://cve.tuxcare.com/els-docker/releases/CLSA-2026:1793099322"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_docker/debian12/advisories/2026/clsa-2026_1793099322.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-10-27T11:09:22Z",
      "generator": {
        "date": "2026-10-27T11:09:22Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1793099322",
      "initial_release_date": "2026-10-27T11:09:22Z",
      "revision_history": [
        {
          "date": "2026-10-27T11:09:22Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-15176, CVE-2026-93479, CVE-2026-97205"
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        "name": "Heap-based Buffer Overflow"
      },
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          "category": "description",
          "text": "A vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias directive together with rewrite and a set or return directive referencing the $request_filename variable. Alternatively, the same result could be achieved when the $request_filename variable is used in an access log format directive. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.\n\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-docker/cve/CVE-2026-15176"
        },
        {
          "category": "external",
          "summary": "https://my.f5.com/manage/s/article/K000162416",
          "url": "https://my.f5.com/manage/s/article/K000162416"
        }
      ],
      "release_date": "2026-10-14T15:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-27T11:08:44.072803Z",
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          "url": "https://cve.tuxcare.com/els-docker/releases/CLSA-2026:1793099322"
        },
        {
          "category": "none_available",
          "date": "2026-10-14T15:17:00Z",
          "details": "Affected",
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            "baseScore": 8.1,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "details": "Important"
        }
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        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.\n\nImpact: \nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only.\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        },
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        {
          "category": "none_available",
          "date": "2026-10-14T15:17:00Z",
          "details": "Affected",
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          "title": "Vulnerability description"
        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "url": "https://cve.tuxcare.com/els-docker/cve/CVE-2026-97205"
        },
        {
          "category": "external",
          "summary": "https://my.f5.com/manage/s/article/K000162608",
          "url": "https://my.f5.com/manage/s/article/K000162608"
        }
      ],
      "release_date": "2026-10-14T15:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-27T11:08:44.072803Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-docker/releases/CLSA-2026:1793099322",
          "product_ids": [
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els15.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els15.arm64"
          ],
          "url": "https://cve.tuxcare.com/els-docker/releases/CLSA-2026:1793099322"
        },
        {
          "category": "none_available",
          "date": "2026-10-14T15:17:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els10.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els10.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els11.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els11.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els14.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els14.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els2.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els3.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els4.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els4.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els6.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els6.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els7.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els7.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els9.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els9.arm64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els10.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els10.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els11.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els11.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els14.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els14.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els2.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els3.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els4.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els4.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els6.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els6.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els7.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els7.arm64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els9.amd64",
            "Debian-12:nginx1.21-0:1.21.6-1~bookworm+tuxcare.els9.arm64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}