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Software · Apache httpd

Apache HTTP Server Vulnerabilities

The latest security flaws in the Apache HTTP Server (httpd), which ones attackers are using, and whether your version is affected.

New flaws, 30 days
3
Critical, 8 weeks
4
On CISA's exploited list
5
Latest exploited
1 May 2025

Run apachectl -v (or httpd -v) on the server.

Apache httpd Security in Short

Apache httpd is the web server behind most cPanel servers and many older sites. Only the 2.4 line is supported. Its flaws often sit in modules (mod_proxy, mod_rewrite, mod_http2), so whether one affects you depends on which modules are switched on.

How to Keep Apache Patched

  • Update through your distribution, or EasyApache on cPanel, then apachectl configtest && systemctl reload apache2 (or httpd).
  • Switch off modules you don't use (a2dismod on Debian and Ubuntu).
  • Hide the version: ServerTokens Prod and ServerSignature Off.

The Past Eight Weeks

Any Score 7+ 8+ 9+

25 flaws, newest first.

11 Nov 2026 assign_headers() · Race condition Concurrent Execution using Shared Resource with Improper Synchronization vulnerability in Apache HTTP Server'… CVE-2026-119618 Not scored

Concurrent Execution using Shared Resource with Improper Synchronization vulnerability in Apache HTTP Server's mod_http2 in assign_headers() can lead to RCE. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.70. Affected releases of mod_h2 from GitHub: from 2.0.8 through 2.0.42.

Patch now · NVD Record

11 Nov 2026 Denial of service NULL pointer dereference vulnerability in Apache HTTP Server's mod_md during HTTP request processing. CVE-2026-106023 Not scored

NULL pointer dereference vulnerability in Apache HTTP Server's mod_md during HTTP request processing. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.69.

Keep an eye · NVD Record

11 Nov 2026 Memory corruption Stack-based buffer overflow vulnerability in Apache HTTP Server's mod_vhost_alias (after CVE-2026-63292) This… CVE-2026-109163 Not scored

Stack-based buffer overflow vulnerability in Apache HTTP Server's mod_vhost_alias (after CVE-2026-63292) This issue affects Apache HTTP Server: 2.4.69.

Keep an eye · NVD Record

1 Oct 2026 Memory corruption Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This… CVE-2026-56154 9.8

Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch now · NVD Record

1 Oct 2026 Memory corruption Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy This iss… CVE-2026-57941 9.8

Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch now · NVD Record

1 Oct 2026 Privilege escalation Improper Privilege Management vulnerability in Apache HTTP Server's mod_ssl via SSLRequire and file-related e… CVE-2026-59797 9.8

Improper Privilege Management vulnerability in Apache HTTP Server's mod_ssl via SSLRequire and file-related expressions. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch now · NVD Record

1 Oct 2026 Memory corruption Integer overflow in mod_dav_fs in Apache HTTP Server through 2.4.68 allows an authenticated WebDAV client wit… CVE-2026-93546 8.8

Integer overflow in mod_dav_fs in Apache HTTP Server through 2.4.68 allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database via PROPPATCH requests declaring many XML namespaces.

Patch this week · NVD Record

1 Oct 2026 Authentication bypass Authentication bypass by capture-replay in mod_auth_digest in Apache Software Foundation Apache HTTP Server 2… CVE-2026-73636 8.1

Authentication bypass by capture-replay in mod_auth_digest in Apache Software Foundation Apache HTTP Server 2.4.x on all platforms allows a man-in-the-middle (MITM) attacker to replay captured digest authentication credentials via crafted requests that trigger garbage collection of the client's shared memory entry when AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Patch this week · NVD Record

1 Oct 2026 Denial of service NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. CVE-2026-46729 7.5

NULL Pointer Dereference vulnerability in Apache HTTP Servers mod_heartmonitor over unicast listener. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch this week · NVD Record

1 Oct 2026 Information disclosure Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache HTTP Server's mod_session_… CVE-2026-47360 7.5

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache HTTP Server's mod_session_cookie module. When SessionCookieRemove changes across internal redirects, the session cookie may still be passed to a backend server. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch this week · NVD Record

1 Oct 2026 Authentication bypass Missing authentication checks in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.… CVE-2026-48005 7.5

Missing authentication checks in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause a denial of service (forced re-authentication) via forged Authorization headers when Digest authentication is enabled with AuthDigestNcCheck . Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Patch this week · NVD Record

1 Oct 2026 Memory corruption Out-of-bounds Write vulnerability in Apache HTTP Server's mod_charset_lite. CVE-2026-56153 7.5

Out-of-bounds Write vulnerability in Apache HTTP Server's mod_charset_lite. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch this week · NVD Record

1 Oct 2026 Memory corruption Out-of-bounds Write vulnerability in Apache HTTP Server's mod_proxy_html with crafted HTTP response bodies. CVE-2026-56449 7.5

Out-of-bounds Write vulnerability in Apache HTTP Server's mod_proxy_html with crafted HTTP response bodies. This issue affects Apache HTTP Server version 2.4.68.

Patch this week · NVD Record

1 Oct 2026 Memory corruption Out-of-bounds Write vulnerability in Apache HTTP Server on Windows while processing paths with 8.3 names that… CVE-2026-59685 7.5

Out-of-bounds Write vulnerability in Apache HTTP Server on Windows while processing paths with 8.3 names that may grow when expanded. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Patch this week · NVD Record

1 Oct 2026 Access control flaw Improper validation of FTP PASV reply address in mod_proxy_ftp in Apache Software Foundation Apache HTTP Serv… CVE-2026-63045 7.5

Improper validation of FTP PASV reply address in mod_proxy_ftp in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows, in forward proxy configurations, an untrusted FTP server to cause the proxy to open a data connection to an arbitrary third-party host via a crafted PASV response. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Patch this week · NVD Record

1 Oct 2026 Memory corruption Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTP Server through 2.4.6… CVE-2026-63292 7.5

Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTP Server through 2.4.68 on all platforms allows a remote client to cause a denial of service or potentially execute arbitrary code via an HTTP request with a Host header exceeding 8192 bytes when VirtualDocumentRoot uses a hostname format specifier and LimitRequestFieldSize is raised above the default. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Patch this week · NVD Record

1 Oct 2026 Denial of service A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on a… CVE-2026-63686 7.5

A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds then fails. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Patch this week · NVD Record

1 Oct 2026 Input validation flaw Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') response smuggling vulnerabi… CVE-2026-63718 7.5

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') response smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi and a crafted uwsgi response with Transfer-Encoding. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.68.

Patch this week · NVD Record

1 Oct 2026 Memory corruption Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platf… CVE-2026-73637 7.3

Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Patch this week · NVD Record

1 Oct 2026 Access control flaw Internal state files accessible to external parties in mod_dav_fs in Apache Software Foundation Apache HTTP S… CVE-2026-58415 5.3

Internal state files accessible to external parties in mod_dav_fs in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows a remote client to read WebDAV dead properties of resources it cannot author via a GET request for the .DAV state directory This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Keep an eye · NVD Record

1 Oct 2026 Security flaw Path equivalence: '/./' (single dot directory) vulnerability in Apache HTTP Server's mod_userdir module when … CVE-2026-79768 5.3

Path equivalence: '/./' (single dot directory) vulnerability in Apache HTTP Server's mod_userdir module when configured with absolute non-wildcard UserDir directive (the 2nd form in https://httpd.apache.org/docs/2.4/mod/mod_userdir.html#userdir) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Keep an eye · NVD Record

1 Oct 2026 Denial of service A memory calculation bug in mod_dav in Apache httpd 2.4.67 and earlier allows an attacker with permission to … CVE-2026-42528 4.3

A memory calculation bug in mod_dav in Apache httpd 2.4.67 and earlier allows an attacker with permission to create WebDAV locks to crash server child processes. Users are recommended to upgrade to version 2.4.69, which fixes this issue

Keep an eye · NVD Record

1 Oct 2026 Security flaw Deployment of wrong handler vulnerability in Apache HTTP Server allows the target of some internal redirects … CVE-2026-42356 3.7

Deployment of wrong handler vulnerability in Apache HTTP Server allows the target of some internal redirects from CGI programs to also be treated as CGI and executed. The target must already be in a directory enabled for CGI and have no other extension understood by mod_mime. This issue affects Apache HTTP Server: from 2.4.60 through 2.4.68.

Keep an eye · NVD Record

22 Sep 2026 Apache HTTP Server · Access control flaw The Apache Lounge Windows distribution of Apache HTTP Server build contains an insecure installation director… CVE-2026-89282 9.1

The Apache Lounge Windows distribution of Apache HTTP Server build contains an insecure installation directory permissions vulnerability through its default install directory on C:\, which inherits write access for Authenticated Users.

Patch now · NVD Record

22 Sep 2026 openssl.cnf path · Access control flaw The Apache Lounge Windows distribution of Apache HTTP Server build contains a hardcoded configuration path vu… CVE-2026-89281 8.4

The Apache Lounge Windows distribution of Apache HTTP Server build contains a hardcoded configuration path vulnerability within openssl.cnf path that can allow local code execution.

Patch this week · NVD Record

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