CVE-2026-57941

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{"bugzilla": {"description": "httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy", "id": "2544864", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544864"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["Use After Free vulnerability in Apache HTTP Server's mod_http2\u00a0via shared session->bbtmp re-entrancy\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.", "A flaw was found in the mod_http2 module of Apache HTTP Server. A remote, unauthenticated attacker could exploit a use-after-free condition\u2014where memory is accessed after being released\u2014through re-entrant processing of shared session buffers. This flaw can allow an attacker to potentially execute arbitrary code or crash the server, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Disable mod_http2 until a fixed package is installed. In /etc/httpd/conf.modules.d/10-h2.conf, comment out the module and restart the service:\n#LoadModule http2_module modules/mod_http2.so\n$ systemctl restart httpd"}, "name": "CVE-2026-57941", "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:10", "fix_state": "Affected", "package_name": "mod_http2", "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:8", "fix_state": "Affected", "package_name": "httpd:2.4/mod_http2", "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:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "mod_http2", "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": "Under investigation", "package_name": "jbcs-httpd24-httpd", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "jbcs-httpd24-mod_http2", "product_name": "Red Hat JBoss Core Services"}], "public_date": "2026-10-01T16:06:53Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-57941\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-57941\nhttp://www.openwall.com/lists/oss-security/2026/10/01/19\nhttps://httpd.apache.org/security/vulnerabilities_24.html"], "statement": "A use-after-free flaw was found in mod_http2, the HTTP/2 module for the Apache HTTP Server. A remote attacker with no privileges can trigger re-entrant use of a shared per-session buffer (session->bbtmp) while the server is handling HTTP/2 traffic. That interleaving is not a single reliable request, and the demonstrated effect is a crash of the httpd worker, which is a denial of service. A further memory-corruption outcome has not been shown.", "threat_severity": "Moderate"}

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