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"full_product_name": { "name": "httpd.src as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:httpd.src" }, "product_reference": "httpd.src", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "mod_ldap as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:mod_ldap" }, "product_reference": "mod_ldap", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "mod_lua as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:mod_lua" }, "product_reference": "mod_lua", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "mod_proxy_html as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:mod_proxy_html" }, "product_reference": "mod_proxy_html", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "mod_session as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:mod_session" }, "product_reference": "mod_session", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "mod_ssl as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:mod_ssl" }, "product_reference": "mod_ssl", "relates_to_product_reference": "red_hat_enterprise_linux_9" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-29167", "cwe": { "id": "CWE-825", "name": "Expired Pointer Dereference" }, "discovery_date": "2026-06-08T16:01:30.220956+00:00", "flags": [ { "label": "vulnerable_code_not_present", "product_ids": [ "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" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2486394" } ], "notes": [ { "category": "description", "text": "A flaw was found in Apache HTTP Server when using the `mod_ldap` module in a per-directory configuration. This use-after-free vulnerability allows a remote attacker to potentially execute arbitrary code or cause a denial of service (DoS) due to improper memory handling. This could lead to system instability or unauthorized control over the affected server.", "title": "Vulnerability description" }, { "category": "summary", "text": "httpd: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap per-directory configuration", "title": "Vulnerability summary" }, { "category": "other", "text": "CISA's 9.8 is a mechanical worst-case UAF score. Their vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H — they're treating it as: \"network-facing service, memory corruption primitive, assume RCE.\" This is how CISA-ADP routinely scores any UAF in a network daemon. They don't analyze actual exploitability; they score the theoretical ceiling of the vulnerability class.\n\nApache's LOW reflects what actually happens. \n\n1. Trigger is narrow — mod_ldap must be loaded (not default) AND configured in per-directory context (, , .htaccess). Server-wide LDAP config doesn't trigger it. This is an unusual configuration pattern.\n2. UAF in config merging, not request handling — the freed memory is in the per-directory configuration merge path, which constrains the timing window and what objects occupy the freed allocation. This isn't a heap spray-friendly UAF in a hot request path.\n3. httpd's process model kills RCE reliability — prefork uses separate processes (crash = one child dies, parent respawns), worker/event have per-process address space. Turning a UAF into reliable RCE against httpd is substantially harder than against a single-threaded daemon with a predictable heap layout.\n4. Realistic impact is DoS — the freed pointer will most likely cause a segfault (child crash), not a controlled write primitive. The parent process respawns workers, so even the DoS is transient.", "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_affected": [ "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", "red_hat_enterprise_linux_8:httpd-devel", "red_hat_enterprise_linux_8:httpd-filesystem", "red_hat_enterprise_linux_8:httpd-manual", "red_hat_enterprise_linux_8:httpd-tools", "red_hat_enterprise_linux_8:httpd.src", "red_hat_enterprise_linux_8:mod_http2", "red_hat_enterprise_linux_8:mod_http2.src", "red_hat_enterprise_linux_8:mod_ldap", "red_hat_enterprise_linux_8:mod_md", "red_hat_enterprise_linux_8:mod_md.src", "red_hat_enterprise_linux_8:mod_proxy_html", "red_hat_enterprise_linux_8:mod_session", "red_hat_enterprise_linux_8:mod_ssl" ], "known_not_affected": [ "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" ], "under_investigation": [ "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_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_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_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" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-29167" }, { "category": "external", "summary": "RHBZ#2486394", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486394" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-29167", "url": "https://www.cve.org/CVERecord?id=CVE-2026-29167" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-29167", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29167" }, { "category": "external", "summary": "https://httpd.apache.org/security/vulnerabilities_24.html", "url": "https://httpd.apache.org/security/vulnerabilities_24.html" } ], "release_date": "2026-06-08T15:07:59.231000+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-06-10T09:40:49+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-2026:25042" }, { "category": "workaround", "details": "upgrade apache web server to 2.4.68", "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", "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", "red_hat_enterprise_linux_8:httpd-devel", "red_hat_enterprise_linux_8:httpd-filesystem", "red_hat_enterprise_linux_8:httpd-manual", "red_hat_enterprise_linux_8:httpd-tools", "red_hat_enterprise_linux_8:httpd.src", "red_hat_enterprise_linux_8:mod_http2", "red_hat_enterprise_linux_8:mod_http2.src", "red_hat_enterprise_linux_8:mod_ldap", "red_hat_enterprise_linux_8:mod_md", "red_hat_enterprise_linux_8:mod_md.src", "red_hat_enterprise_linux_8:mod_proxy_html", "red_hat_enterprise_linux_8:mod_session", "red_hat_enterprise_linux_8:mod_ssl" ] }, { "category": "none_available", "details": "Affected", "product_ids": [ "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", "red_hat_enterprise_linux_8:httpd-devel", "red_hat_enterprise_linux_8:httpd-filesystem", "red_hat_enterprise_linux_8:httpd-manual", "red_hat_enterprise_linux_8:httpd-tools", "red_hat_enterprise_linux_8:httpd.src", "red_hat_enterprise_linux_8:mod_http2", "red_hat_enterprise_linux_8:mod_http2.src", "red_hat_enterprise_linux_8:mod_ldap", "red_hat_enterprise_linux_8:mod_md", "red_hat_enterprise_linux_8:mod_md.src", "red_hat_enterprise_linux_8:mod_proxy_html", "red_hat_enterprise_linux_8:mod_session", "red_hat_enterprise_linux_8:mod_ssl" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L", "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", "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_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", "red_hat_enterprise_linux_8:httpd-devel", "red_hat_enterprise_linux_8:httpd-filesystem", "red_hat_enterprise_linux_8:httpd-manual", "red_hat_enterprise_linux_8:httpd-tools", "red_hat_enterprise_linux_8:httpd.src", "red_hat_enterprise_linux_8:mod_http2", "red_hat_enterprise_linux_8:mod_http2.src", "red_hat_enterprise_linux_8:mod_ldap", "red_hat_enterprise_linux_8:mod_md", "red_hat_enterprise_linux_8:mod_md.src", "red_hat_enterprise_linux_8:mod_proxy_html", "red_hat_enterprise_linux_8:mod_session", "red_hat_enterprise_linux_8:mod_ssl", "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_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" ] } ], "threats": [ { "category": "impact", "details": "Low", "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", "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_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", "red_hat_enterprise_linux_8:httpd-devel", "red_hat_enterprise_linux_8:httpd-filesystem", "red_hat_enterprise_linux_8:httpd-manual", "red_hat_enterprise_linux_8:httpd-tools", "red_hat_enterprise_linux_8:httpd.src", "red_hat_enterprise_linux_8:mod_http2", "red_hat_enterprise_linux_8:mod_http2.src", "red_hat_enterprise_linux_8:mod_ldap", "red_hat_enterprise_linux_8:mod_md", "red_hat_enterprise_linux_8:mod_md.src", "red_hat_enterprise_linux_8:mod_proxy_html", "red_hat_enterprise_linux_8:mod_session", "red_hat_enterprise_linux_8:mod_ssl", "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_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" ] } ], "title": "httpd: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap per-directory configuration" } ] }