CVE-2026-42536

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{"bugzilla": {"description": "httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc", "id": "2486411", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486411"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["Heap-based Buffer Overflow vulnerability in Apache HTTP Server with\u00a0mod_xml2enc, xml2StartParse, and untrusted content\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.\nUsers are recommended to upgrade to version 2.4.68, which fixes the issue.", "A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. This heap-based buffer overflow vulnerability can be triggered when processing untrusted content through the xml2StartParse function. A remote attacker could potentially exploit this to cause a denial of service, information disclosure, or possibly arbitrary code execution."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, disable the `mod_xml2enc` module if its functionality for XML internationalization is not essential. This can be done by commenting out the `LoadModule xml2enc_module modules/mod_xml2enc.so` directive in the Apache HTTP Server configuration. A service restart is required for the change to take effect.\n```bash\n# Edit the Apache configuration file, e.g., /etc/httpd/conf.modules.d/00-base.conf\n# Comment out the line:\n# LoadModule xml2enc_module modules/mod_xml2enc.so\n# Reload the httpd service\nsudo systemctl reload httpd\n```\n*Note: Disabling `mod_xml2enc` will cause any configurations relying heavily on `mod_proxy_html` or raw HTML/XML encoding conversions to function incorrectly or fail. Red Hat strongly recommends upgrading to a patched version of `httpd` as soon as it becomes available for your specific RHEL channel.*"}, "name": "CVE-2026-42536", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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"}], "public_date": "2026-06-08T15:23:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-42536\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42536\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "In Red Hat Enterprise Linux (RHEL), the httpd package includes mod_xml2enc, which provides encoding support for filters like mod_proxy_html. Because this flaw relies on processing unvetted or untrusted input text lengths, the impact presents a high risk to availability (Denial of Service via worker crashes) and a potential risk to confidentiality if an attacker is capable of executing remote code within the context of the apache or httpd daemon process.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.0,2.4.67]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache HTTP Server", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "http_server", "vendor": "apache"}], "created": "2026-06-08T16:30:06.601623+00:00", "updated": "2026-10-25T18:45:07.050959+00:00", "vendors": ["apache", "apache$PRODUCT$http_server"]}