CVE-2026-23918

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://httpd.apache.org/security/vulnerabilities_24.html	Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/04/19	Mailing List Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:13938
https://access.redhat.com/security/cve/CVE-2026-23918
https://bugzilla.redhat.com/show_bug.cgi?id=2465304
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23918.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:http_server:2.4.66:*:*:*:*:*:*:*

History

26 Oct 2026, 19:10

Type	Values Removed	Values Added
Summary		(es) Vulnerabilidad de Doble Liberación y posible RCE en el Servidor HTTP Apache con el protocolo HTTP/2. Este problema afecta al Servidor HTTP Apache: 2.4.66. Se recomienda a los usuarios actualizar a la versión 2.4.67, que corrige el problema.

Information

Published : 2026-05-04 15:16

Updated : 2026-10-26 19:10

NVD link : CVE-2026-23918

Mitre link : CVE-2026-23918

CVE.ORG link : CVE-2026-23918

JSON object : View

Products Affected

apache

http_server

CWE

CWE-415

Double Free

CWE-1341

Multiple Releases of Same Resource or Handle

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"NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache HTTP Server", "versions": [{"status": "affected", "version": "2.4.66", "versionType": "semver"}], "defaultStatus": "unaffected"}]}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "affectedData": [{"cpes": ["cpe:/a:redhat:hummingbird:1"], "vendor": "Red Hat", "product": "Red Hat Hardened Images", "versions": [{"status": "unaffected", "version": "2.4.67-0.1.hum1", "lessThan": "*", "versionType": "rpm"}], "packageName": "httpd-main", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:10"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "httpd", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:10"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "mod_http2", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "httpd", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "httpd", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "httpd:2.4/httpd", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "httpd:2.4/mod_http2", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "httpd", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "mod_http2", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:jboss_core_services:1"], "vendor": "Red Hat", "product": "Red Hat JBoss Core Services", "packageName": "mod_http2", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}]}], "published": "2026-05-04T15:16:03.583", "references": [{"url": "https://httpd.apache.org/security/vulnerabilities_24.html", "tags": ["Vendor Advisory"], "source": "security@apache.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/04/19", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://access.redhat.com/errata/RHSA-2026:13938", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-23918", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2465304", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23918.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-415"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-1341"}]}], "descriptions": [{"lang": "en", "value": "Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol.\n\nThis issue affects Apache HTTP Server: 2.4.66.\n\nUsers are recommended to upgrade to version 2.4.67, which fixes the issue."}, {"lang": "es", "value": "Vulnerabilidad de Doble Liberaci\u00f3n y posible RCE en el Servidor HTTP Apache con el protocolo HTTP/2.\n\nEste problema afecta al Servidor HTTP Apache: 2.4.66.\n\nSe recomienda a los usuarios actualizar a la versi\u00f3n 2.4.67, que corrige el problema."}], "lastModified": "2026-10-26T19:10:00.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:http_server:2.4.66:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3F48B216-98B0-4261-8E74-3BCC6F37CD8C"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}