CVE-2026-63686

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{"affected_release": [{"advisory": "RHSA-2026:74858", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "httpd-main-2.4.69-1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-02T00:00:00Z"}], "bugzilla": {"description": "httpd: httpd: Denial of Service via charset conversion failure in mod_xml2enc", "id": "2544852", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544852"}, "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": "verified"}, "cwe": "CWE-476", "details": ["A flaw was found in the mod_xml2enc module of the Apache HTTP Server. An untrusted backend server can cause a Denial of Service (DoS) by returning a crafted response with a character set whose conversion partially succeeds and then fails. Processing this response triggers an invalid memory access (null pointer dereference), causing the server process to crash."], "mitigation": {"lang": "en:us", "value": "If proxy character set transcoding is not required, disable the mod_xml2enc module by commenting out its configuration directive.\n1. Edit the module configuration file (typically located under `/etc/httpd/conf.modules.d/`) and comment out the loading directive:\n# LoadModule xml2enc_module modules/mod_xml2enc.so\n2. Verify the configuration syntax:\nhttpd -t\n3. Reload the Apache HTTP Server to apply changes:\nsystemctl reload httpd\nCaveats: Disabling mod_xml2enc will break modules that depend on XML or HTML character set conversion, such as mod_proxy_html. If this module is required, restrict proxy rules so httpd communicates only with trusted upstream backends.\nWarning: Reloading or restarting the httpd service may cause a brief interruption to active connections."}, "name": "CVE-2026-63686", "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:2.4/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"}], "public_date": "2026-10-01T16:20:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63686\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63686\nhttp://www.openwall.com/lists/oss-security/2026/10/01/25\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "threat_severity": "Important"}

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