CVE-2026-109163

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache HTTP Server", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "2.4.70", "status": "affected", "version": "2.4.69", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Stack-based buffer overflow vulnerability in Apache HTTP Server's mod_vhost_alias (after\u00a0CVE-2026-63292)\n\n\n\nThis issue affects Apache HTTP Server: 2.4.69."}], "id": "CVE-2026-109163", "lastModified": "2026-11-12T17:06:26.857", "metrics": {}, "published": "2026-11-11T15:17:14.097", "references": [{"source": "security@apache.org", "url": "https://httpd.apache.org/security/vulnerabilities_24.html"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "security@apache.org", "type": "Primary"}]}

{"bugzilla": {"description": "httpd: httpd: Denial of Service via stack-based buffer overflow in mod_vhost_alias", "id": "2571737", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2571737"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-121", "details": ["A flaw was found in Apache HTTP Server's mod_vhost_alias module. A remote attacker could trigger a stack-based buffer overflow by sending a specially crafted HTTP request. This issue leads to a one-byte memory overwrite on the stack, which can crash the server process and result in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "If dynamic mass virtual hosting is not required, disable the `mod_vhost_alias` module:\n1. Comment out the `vhost_alias_module` line in `/etc/httpd/conf.modules.d/00-base.conf` (or the respective configuration file loading the module):\n```\n# LoadModule vhost_alias_module modules/mod_vhost_alias.so\n```\n2. Restart the Apache HTTP Server service to apply the change:\n```\nsystemctl restart httpd\n```\nWarning: Restarting or reloading the `httpd` service interrupts active connections. Disabling `mod_vhost_alias` will break virtual host resolution for deployments configured with directives such as `VirtualDocumentRoot` or `VirtualScriptAlias`."}, "name": "CVE-2026-109163", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:6", "fix_state": "Not affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Not affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "httpd:2.4/httpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Not affected", "package_name": "jbcs-httpd24-httpd", "product_name": "Red Hat JBoss Core Services"}], "public_date": "2026-11-11T14:55:08Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-109163\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-109163\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation terminates worker processes, resulting in a denial of service without leading to remote code execution. In typical Red Hat deployments, dynamic mass virtual hosting using mod_vhost_alias is not enabled by default and requires explicit configuration directives such as VirtualDocumentRoot. Consequently, systems running standard web server configurations without mod_vhost_alias directives are unaffected by this issue.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.69,2.4.70]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache HTTP Server", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "apache_http_server", "vendor": "apache"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.69,2.4.70]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache HTTP Server", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "http_server", "vendor": "apache"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.69,2.4.70]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache HTTP Server", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "apache_http_server", "vendor": "apache_software_foundation"}], "created": "2026-11-12T07:45:21.752518+00:00", "updated": "2026-11-13T02:45:13.610917+00:00", "vendors": ["apache", "apache$PRODUCT$apache_http_server", "apache$PRODUCT$http_server", "apache_software_foundation", "apache_software_foundation$PRODUCT$apache_http_server"]}