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"vulnerabilities": [ { "cve": "CVE-2026-23918", "cwe": { "id": "CWE-1341", "name": "Multiple Releases of Same Resource or Handle" }, "discovery_date": "2026-05-04T15:01:41.066212+00:00", "flags": [ { "label": "vulnerable_code_not_present", "product_ids": [ "red_hat_enterprise_linux_10:httpd", "red_hat_enterprise_linux_10:httpd-core", "red_hat_enterprise_linux_10:httpd-devel", "red_hat_enterprise_linux_10:httpd-filesystem", "red_hat_enterprise_linux_10:httpd-manual", "red_hat_enterprise_linux_10:httpd-tools", "red_hat_enterprise_linux_10:httpd.src", "red_hat_enterprise_linux_10:mod_http2", "red_hat_enterprise_linux_10:mod_http2.src", "red_hat_enterprise_linux_10:mod_ldap", "red_hat_enterprise_linux_10:mod_lua", "red_hat_enterprise_linux_10:mod_proxy_html", "red_hat_enterprise_linux_10:mod_session", "red_hat_enterprise_linux_10:mod_ssl", "red_hat_enterprise_linux_6:httpd", "red_hat_enterprise_linux_6:httpd-devel", "red_hat_enterprise_linux_6:httpd-manual", 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"red_hat_enterprise_linux_8:mod_md.src::httpd:2.4", "red_hat_enterprise_linux_8:mod_md::httpd:2.4", "red_hat_enterprise_linux_8:mod_proxy_html::httpd:2.4", "red_hat_enterprise_linux_8:mod_session::httpd:2.4", "red_hat_enterprise_linux_8:mod_ssl::httpd:2.4", "red_hat_enterprise_linux_9:httpd", "red_hat_enterprise_linux_9:httpd-core", "red_hat_enterprise_linux_9:httpd-devel", "red_hat_enterprise_linux_9:httpd-filesystem", "red_hat_enterprise_linux_9:httpd-manual", "red_hat_enterprise_linux_9:httpd-tools", "red_hat_enterprise_linux_9:httpd.src", "red_hat_enterprise_linux_9:mod_http2", "red_hat_enterprise_linux_9:mod_http2.src", "red_hat_enterprise_linux_9:mod_ldap", "red_hat_enterprise_linux_9:mod_lua", "red_hat_enterprise_linux_9:mod_proxy_html", "red_hat_enterprise_linux_9:mod_session", "red_hat_enterprise_linux_9:mod_ssl", "red_hat_jboss_core_services:mod_http2" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2465304" } ], "notes": [ { "category": "description", "text": "A flaw was found in Apache HTTP Server. This vulnerability, related to a double free error within the HTTP/2 protocol implementation, could potentially allow a remote attacker to execute arbitrary code. Successful exploitation could lead to a complete compromise of the affected system.", "title": "Vulnerability description" }, { "category": "summary", "text": "Apache HTTP Server: Apache HTTP Server: Remote Code Execution via Double Free in HTTP/2 Protocol", "title": "Vulnerability summary" }, { "category": "other", "text": "This issue marked as Important rather than Moderate because it involves a memory safety violation (double free) in the HTTP/2 request handling path, which is directly exposed to untrusted network input. A double free condition can corrupt the heap allocator’s internal metadata, enabling attackers to manipulate memory layout and potentially achieve arbitrary code execution (RCE) under favorable conditions. In this case, the flaw is triggered during an early stream reset in HTTP/2, meaning it can be exercised pre-authentication by a remote client without requiring complex application-level interaction. Given that Apache HTTP Server is widely deployed in internet-facing environments, even a low-probability RCE path significantly elevates risk.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "Red Hat Hardened Images:httpd-main@aarch64", "Red Hat Hardened Images:httpd-main@noarch", "Red Hat Hardened Images:httpd-main@src", "Red Hat Hardened Images:httpd-main@x86_64" ], "known_not_affected": [ "red_hat_enterprise_linux_10:httpd", "red_hat_enterprise_linux_10:httpd-core", "red_hat_enterprise_linux_10:httpd-devel", "red_hat_enterprise_linux_10:httpd-filesystem", "red_hat_enterprise_linux_10:httpd-manual", "red_hat_enterprise_linux_10:httpd-tools", "red_hat_enterprise_linux_10:httpd.src", "red_hat_enterprise_linux_10:mod_http2", "red_hat_enterprise_linux_10:mod_http2.src", "red_hat_enterprise_linux_10:mod_ldap", "red_hat_enterprise_linux_10:mod_lua", "red_hat_enterprise_linux_10:mod_proxy_html", "red_hat_enterprise_linux_10:mod_session", "red_hat_enterprise_linux_10:mod_ssl", "red_hat_enterprise_linux_6:httpd", "red_hat_enterprise_linux_6:httpd-devel", "red_hat_enterprise_linux_6:httpd-manual", "red_hat_enterprise_linux_6:httpd-tools", "red_hat_enterprise_linux_6:httpd.src", "red_hat_enterprise_linux_6:mod_ssl", "red_hat_enterprise_linux_7:httpd", "red_hat_enterprise_linux_7:httpd-devel", "red_hat_enterprise_linux_7:httpd-manual", "red_hat_enterprise_linux_7:httpd-tools", "red_hat_enterprise_linux_7:httpd.src", "red_hat_enterprise_linux_7:mod_ldap", "red_hat_enterprise_linux_7:mod_proxy_html", "red_hat_enterprise_linux_7:mod_session", "red_hat_enterprise_linux_7:mod_ssl", "red_hat_enterprise_linux_8:httpd-devel::httpd:2.4", "red_hat_enterprise_linux_8:httpd-filesystem::httpd:2.4", "red_hat_enterprise_linux_8:httpd-manual::httpd:2.4", "red_hat_enterprise_linux_8:httpd-tools::httpd:2.4", "red_hat_enterprise_linux_8:httpd.src::httpd:2.4", "red_hat_enterprise_linux_8:httpd::httpd:2.4", "red_hat_enterprise_linux_8:mod_http2.src::httpd:2.4", "red_hat_enterprise_linux_8:mod_http2::httpd:2.4", "red_hat_enterprise_linux_8:mod_ldap::httpd:2.4", "red_hat_enterprise_linux_8:mod_md.src::httpd:2.4", "red_hat_enterprise_linux_8:mod_md::httpd:2.4", "red_hat_enterprise_linux_8:mod_proxy_html::httpd:2.4", "red_hat_enterprise_linux_8:mod_session::httpd:2.4", "red_hat_enterprise_linux_8:mod_ssl::httpd:2.4", "red_hat_enterprise_linux_9:httpd", "red_hat_enterprise_linux_9:httpd-core", "red_hat_enterprise_linux_9:httpd-devel", "red_hat_enterprise_linux_9:httpd-filesystem", "red_hat_enterprise_linux_9:httpd-manual", "red_hat_enterprise_linux_9:httpd-tools", "red_hat_enterprise_linux_9:httpd.src", "red_hat_enterprise_linux_9:mod_http2", "red_hat_enterprise_linux_9:mod_http2.src", "red_hat_enterprise_linux_9:mod_ldap", "red_hat_enterprise_linux_9:mod_lua", "red_hat_enterprise_linux_9:mod_proxy_html", "red_hat_enterprise_linux_9:mod_session", "red_hat_enterprise_linux_9:mod_ssl", "red_hat_jboss_core_services:mod_http2" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-23918" }, { "category": "external", "summary": "RHBZ#2465304", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2465304" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-23918", "url": "https://www.cve.org/CVERecord?id=CVE-2026-23918" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23918", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23918" }, { "category": "external", "summary": "https://httpd.apache.org/security/vulnerabilities_24.html", "url": "https://httpd.apache.org/security/vulnerabilities_24.html" } ], "release_date": "2026-05-04T14:44:28.513000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-05-06T08:55:25+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/", "product_ids": [ "Red Hat Hardened Images:httpd-main@aarch64", "Red Hat Hardened Images:httpd-main@noarch", "Red Hat Hardened Images:httpd-main@src", "Red Hat Hardened Images:httpd-main@x86_64" ], "url": "https://access.redhat.com/errata/RHSA-2026:13938" }, { "category": "workaround", "details": "To mitigate this issue, disable the `mod_http2` module in your Apache HTTP Server configuration. This can be achieved by commenting out or removing the `LoadModule http2_module modules/mod_http2.so` line in the Apache configuration file (e.g., `/etc/httpd/conf.modules.d/00-base.conf` or a similar configuration file). After modifying the configuration, restart the httpd service for the changes to take effect. This action will impact services relying on HTTP/2 functionality.", "product_ids": [ "Red Hat Hardened Images:httpd-main@aarch64", "Red Hat Hardened Images:httpd-main@noarch", "Red Hat Hardened Images:httpd-main@src", "Red Hat Hardened Images:httpd-main@x86_64" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Red Hat Hardened Images:httpd-main@aarch64", "Red Hat Hardened Images:httpd-main@noarch", "Red Hat Hardened Images:httpd-main@src", "Red Hat Hardened Images:httpd-main@x86_64", "red_hat_enterprise_linux_10:httpd", "red_hat_enterprise_linux_10:httpd-core", "red_hat_enterprise_linux_10:httpd-devel", 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"red_hat_enterprise_linux_9:mod_http2", "red_hat_enterprise_linux_9:mod_http2.src", "red_hat_enterprise_linux_9:mod_ldap", "red_hat_enterprise_linux_9:mod_lua", "red_hat_enterprise_linux_9:mod_proxy_html", "red_hat_enterprise_linux_9:mod_session", "red_hat_enterprise_linux_9:mod_ssl", "red_hat_jboss_core_services:mod_http2" ] } ], "title": "Apache HTTP Server: Apache HTTP Server: Remote Code Execution via Double Free in HTTP/2 Protocol" } ] }