CVE-2026-56154

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{"bugzilla": {"description": "httpd: httpd: Denial of Service via mod_rewrite lookahead", "id": "2544869", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544869"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...})\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.", "A use-after-free flaw was found in the mod_rewrite module of Apache HTTP Server when evaluating URL lookahead expressions that reference HTTP request headers, such as %{LA-U:HTTP:...}. A remote attacker may be able to trigger invalid memory access in a server using an affected rewrite configuration, potentially causing a denial of service or arbitrary code execution."], "mitigation": {"lang": "en:us", "value": "Review the effective Apache HTTP Server configuration, including virtual host configurations and .htaccess files, for affected HTTP-header lookahead expressions such as %{LA-U:HTTP:...}. Remove or replace these expressions where application requirements permit.\nAlternatively, disable mod_rewrite if the application does not require it. These changes may affect URL rewriting and application routing. Validate the configuration and reload or restart the service as appropriate.\nApply a vendor-supported security update containing the fix when available."}, "name": "CVE-2026-56154", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "httpd", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-01T16:03:52Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-56154\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56154\nhttp://www.openwall.com/lists/oss-security/2026/10/01/17\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "Red Hat initially assesses this issue as Important due to the potential for remote denial of service or code execution in affected mod_rewrite configurations. Exploitation requires URL lookahead expressions that reference HTTP request headers, such as %{LA-U:HTTP:...}. Product-specific impact and exploitation conditions remain under review with Engineering.", "threat_severity": "Important"}

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