CVE-2026-58415

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.

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.

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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.(CVE-2026-48005)

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.(CVE-2026-58415)

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.(CVE-2026-59685)

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.(CVE-2026-59797)

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.(CVE-2026-63045)

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.(CVE-2026-63292)

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.(CVE-2026-63686)

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.(CVE-2026-63718)

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.(CVE-2026-73636)

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.(CVE-2026-73637)

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…

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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.(CVE-2026-56153)

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.(CVE-2026-56154)

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.(CVE-2026-57941)

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.(CVE-2026-58415)

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.(CVE-2026-59685)

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.(CVE-2026-59797)

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.(CVE-2026-63045)

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.(CVE-2026-63292)

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.(CVE-2026-63686)

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.(CVE-2026-63718)

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.(CVE-2026-79768)

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.(CVE-2026-93546)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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.(CVE-2026-58415)

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.(CVE-2026-59685)

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.(CVE-2026-59797)

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.(CVE-2026-63045)

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.(CVE-2026-63292)

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.(CVE-2026-63686)

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.(CVE-2026-63718)

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.(CVE-2026-79768)

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.(CVE-2026-93546)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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(CVE-2026-42528)

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.(CVE-2026-46729)

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.(CVE-2026-47360)

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.(CVE-2026-56153)

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.(CVE-2026-56154)

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.(CVE-2026-57941)

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.(CVE-2026-58415)

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.(CVE-2026-59685)

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.(CVE-2026-59797)

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.(CVE-2026-63045)

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.(CVE-2026-63292)

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.(CVE-2026-63686)

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.(CVE-2026-63718)

Path equivalence: '/./' (single dot directory) vulnerability in Apache HTTP Server's mod_userdir module when configured with absolute non-wildcard UserDir directive (the 2nd…

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.

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.

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.

• CVE-2026-58415: mod_dav_fs: deny every request for the .DAV state directory from a fixup hook, so the default handler can no longer serve the lock and property databases to GET requests (information disclosure)
• CVE-2026-59797: mod_ssl: restrict the file() and filesize() functions in SSLRequire expressions read from .htaccess files (improper privilege management)
• CVE-2026-63045: mod_proxy_ftp: reject a PASV reply whose address differs from the FTP server of the control connection (FTP bounce)
• CVE-2026-79768: mod_userdir: fix the check rejecting "." and ".." as user names, which tested the wrong characters (information disclosure)
• CVE-2026-42356: do not pass the trusted content type of a request on to its internal redirect in ap_internal_redirect_handler(), so the redirect target is not run as CGI (limited remote code execution)

• CVE-2026-63718: mod_proxy_uwsgi: drop hop-by-hop headers from the backend response
• CVE-2026-73636: mod_auth_digest: accept a one-time nonce only once, also when the client entry was garbage collected
• CVE-2026-73637: mod_auth_digest: don't use a client entry outside the client lock
• CVE-2026-48005: mod_auth_digest: track the nonce-count per nonce and record it only for a fully verified request
• mod_auth_digest: configs using "AuthDigestQop none" or the "authdigest-opaque" Mutex type no longer start ("AuthDigestQop none" in .htaccess: 500; the shipped manual still documents it); RFC 2069 clients (no qop) are refused; with AuthDigestNcCheck On or AuthDigestNonceLifetime 0, 503 if no client entry fits in shared memory; log ids AH01767, AH01771, AH01772, AH01792 and AH01793 are removed
• mod_auth_digest: with AuthDigestNcCheck On, a request that is authenticated twice (e.g. a DirectoryIndex file in its own <Files> section) is refused with 401
• mod_auth_digest: after a reload (also the logrotate one) or a SIGHUP restart a captured request can be accepted once more under AuthDigestNonceLifetime 0 or AuthDigestNcCheck; only stopping httpd (systemctl restart) invalidates it (fixed upstream only in trunk f4c4160fbf, not in 2.4.69)
• CVE-2026-63686: mod_xml2enc: avoid a NULL pointer dereference when a charset conversion fails part way
• CVE-2026-63045: mod_proxy_ftp: reject a PASV reply whose address differs from the control connection peer
• CVE-2026-42528: mod_dav: limit the number of shared locks on a resource
• CVE-2026-93546: mod_dav_fs: cap the property database namespace table at 2048 entries
• CVE-2026-58415: mod_dav_fs: deny access to the .DAV state directory for all methods, including GET
• CVE-2026-59797: mod_ssl: don't allow file() and filesize() in SSLRequire from .htaccess files
• CVE-2026-79768: mod_userdir: reject "." as a user name

Limited RCE for some internal redirects to non-CGI files in CGI directories. (CVE-2026-42356) mod_dav shared lock overflow. (CVE-2026-42528) mod_heartmonitor denial of service. (CVE-2026-46729) mod_session: Session cookie not removed during internal redirect. (CVE-2026-47360) mod_auth_digest reauthentication attack. (CVE-2026-48005) mod_charset_lite: Heap overflow in finish_partial_char. (CVE-2026-56153) mod_rewrite use-after-free via %{LA-U:HTTP:...}. (CVE-2026-56154) mod_proxy_html: crash in dump_content. (CVE-2026-56449) mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy. (CVE-2026-57941) mod_dav_fs property database read access. (CVE-2026-58415) Out-of-Bounds Write in ap_directory_walk() Canonical-Name Rewrite on CASE_BLIND_FILESYSTEM. (CVE-2026-59685) mod_ssl SSLRequire allows .htaccess ap_expr file-function. (CVE-2026-59797) mod_proxy_ftp PASV address handling. (CVE-2026-63045) mod_vhost_alias stack overflow. (CVE-2026-63292) mod_xml2enc crash on charset conversion failure. (CVE-2026-63686) mod_proxy_uwsgi Transfer-Encoding response smuggling. (CVE-2026-63718) mod_auth_digest one-time-nonce replay attack. (CVE-2026-73636) mod_auth_digest DoS attack. (CVE-2026-73637) mod_userdir information disclosure. (CVE-2026-79768) mod_dav_fs namespace overflow. (CVE-2026-93546)

This update for apache2 fixes the following issues:

• CVE-2026-42356: deployment of wrong handler allows target of internal redirects from CGI programs to also be treated as CGI and executed (bsc#1284043).
• CVE-2026-42528: memory calculation bug in mod_dav allows an attacker with permission to create WebDAV locks to crash server child processes (bsc#1284044).
• CVE-2026-46729: NULL pointer dereference in mod_heartmonitor over unicast listener (bsc#1284045).
• CVE-2026-47360: session cookie passed to a backend server when SessionCookieRemove changes across internal redirects (bsc#1284046).
• CVE-2026-48005: missing authentication checks in mod_auth_digest allows an unauthenticated remote client to cause a DoS via forged Authorization headers when Digest authentication is enabled with AuthDigestNcCheck (bsc#1284047).
• CVE-2026-56153: out-of-bounds write in mod_charset_lite (bsc#1284048).
• CVE-2026-56154: use-after-free in mod_rewrite when using lookahead (%{LA-U:HTTP:...}) (bsc#1284049).
• CVE-2026-57941: use-after-free in mod_http2 via shared session->bbtmp re-entrancy (bsc#1284050).
• CVE-2026-58415: internal state files accessible to external parties in mod_dav_fs allows a remote client to read WebDAV dead properties of resources it cannot author via a GET request for the .DAV state directory (bsc#1284051).
• CVE-2026-59797: improper privilege management in mod_ssl when using SSLRequire and file-related expressions (bsc#1284059).
• CVE-2026-63045: improper validation of FTP PASV reply address in mod_proxy_ftp allows an untrusted FTP server to cause a proxy to open a data connection to an arbitrary third-party host (bsc#1284060).
• CVE-2026-63292: stack-based buffer overflow in mod_vhost_alias allows a remote client to cause a DoS or potentially execute arbitrary code via an HTTP request with a specially crafted Host header (bsc#1284061).
• CVE-2026-63686: NULL pointer dereference in mod_xml2enc allows an untrusted backend server to cause a denial of service via a crafted proxied response (bsc#1284058).
• CVE-2026-63718: inconsistent interpretation of HTTP requests in mod_proxy_uwsgi allows for response smuggling via a crafted uwsgi response with Transfer-Encoding (bsc#1284057).
• CVE-2026-73636: authentication bypass by capture-replay in mod_auth_digest allows a MiTM attacker to replay captured digest authentication credentials via crafted requests (bsc#1284056).
• CVE-2026-73637: use-after-free in mod_auth_digest allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests (bsc#1284055).
• CVE-2026-79768: path equivalence issue in the mod_userdir module when configured with absolute non-wildcard UserDir directive (bsc#1284054).
• CVE-2026-93546: integer overflow in mod_dav_fs allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database (bsc#1284053).

This update for apache2 fixes the following issues:

• CVE-2026-42356: deployment of wrong handler allows target of internal redirects from CGI programs to also be treated as CGI and executed (bsc#1284043).
• CVE-2026-42528: memory calculation bug in mod_dav allows an attacker with permission to create WebDAV locks to crash server child processes (bsc#1284044).
• CVE-2026-46729: NULL pointer dereference in mod_heartmonitor over unicast listener (bsc#1284045).
• CVE-2026-47360: session cookie passed to a backend server when SessionCookieRemove changes across internal redirects (bsc#1284046).
• CVE-2026-48005: missing authentication checks in mod_auth_digest allows an unauthenticated remote client to cause a DoS via forged Authorization headers when Digest authentication is enabled with AuthDigestNcCheck (bsc#1284047).
• CVE-2026-56153: out-of-bounds write in mod_charset_lite (bsc#1284048).
• CVE-2026-56154: use-after-free in mod_rewrite when using lookahead (%{LA-U:HTTP:...}) (bsc#1284049).
• CVE-2026-57941: use-after-free in mod_http2 via shared session->bbtmp re-entrancy (bsc#1284050).
• CVE-2026-58415: internal state files accessible to external parties in mod_dav_fs allows a remote client to read WebDAV dead properties of resources it cannot author via a GET request for the .DAV state directory (bsc#1284051).
• CVE-2026-59797: improper privilege management in mod_ssl when using SSLRequire and file-related expressions (bsc#1284059).
• CVE-2026-63045: improper validation of FTP PASV reply address in mod_proxy_ftp allows an untrusted FTP server to cause a proxy to open a data connection to an arbitrary third-party host (bsc#1284060).
• CVE-2026-63292: stack-based buffer overflow in mod_vhost_alias allows a remote client to cause a DoS or potentially execute arbitrary code via an HTTP request with a specially crafted Host header (bsc#1284061).
• CVE-2026-63686: NULL pointer dereference in mod_xml2enc allows an untrusted backend server to cause a denial of service via a crafted proxied response (bsc#1284058).
• CVE-2026-63718: inconsistent interpretation of HTTP requests in mod_proxy_uwsgi allows for response smuggling via a crafted uwsgi response with Transfer-Encoding (bsc#1284057).
• CVE-2026-73636: authentication bypass by capture-replay in mod_auth_digest allows a MiTM attacker to replay captured digest authentication credentials via crafted requests (bsc#1284056).
• CVE-2026-73637: use-after-free in mod_auth_digest allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests (bsc#1284055).
• CVE-2026-79768: path equivalence issue in the mod_userdir module when configured with absolute non-wildcard UserDir directive (bsc#1284054).
• CVE-2026-93546: integer overflow in mod_dav_fs allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database (bsc#1284053).

This update for apache2 fixes the following issues:

• CVE-2026-42356: deployment of wrong handler allows target of internal redirects from CGI programs to also be treated as CGI and executed (bsc#1284043).
• CVE-2026-42528: memory calculation bug in mod_dav allows an attacker with permission to create WebDAV locks to crash server child processes (bsc#1284044).
• CVE-2026-46729: NULL pointer dereference in mod_heartmonitor over unicast listener (bsc#1284045).
• CVE-2026-47360: session cookie passed to a backend server when SessionCookieRemove changes across internal redirects (bsc#1284046).
• CVE-2026-48005: missing authentication checks in mod_auth_digest allows an unauthenticated remote client to cause a DoS via forged Authorization headers when Digest authentication is enabled with AuthDigestNcCheck (bsc#1284047).
• CVE-2026-56153: out-of-bounds write in mod_charset_lite (bsc#1284048).
• CVE-2026-56154: use-after-free in mod_rewrite when using lookahead (%{LA-U:HTTP:...}) (bsc#1284049).
• CVE-2026-57941: use-after-free in mod_http2 via shared session->bbtmp re-entrancy (bsc#1284050).
• CVE-2026-58415: internal state files accessible to external parties in mod_dav_fs allows a remote client to read WebDAV dead properties of resources it cannot author via a GET request for the .DAV state directory (bsc#1284051).
• CVE-2026-59797: improper privilege management in mod_ssl when using SSLRequire and file-related expressions (bsc#1284059).
• CVE-2026-63045: improper validation of FTP PASV reply address in mod_proxy_ftp allows an untrusted FTP server to cause a proxy to open a data connection to an arbitrary third-party host (bsc#1284060).
• CVE-2026-63292: stack-based buffer overflow in mod_vhost_alias allows a remote client to cause a DoS or potentially execute arbitrary code via an HTTP request with a specially crafted Host header (bsc#1284061).
• CVE-2026-63686: NULL pointer dereference in mod_xml2enc allows an untrusted backend server to cause a denial of service via a crafted proxied response (bsc#1284058).
• CVE-2026-63718: inconsistent interpretation of HTTP requests in mod_proxy_uwsgi allows for response smuggling via a crafted uwsgi response with Transfer-Encoding (bsc#1284057).
• CVE-2026-73636: authentication bypass by capture-replay in mod_auth_digest allows a MiTM attacker to replay captured digest authentication credentials via crafted requests (bsc#1284056).
• CVE-2026-73637: use-after-free in mod_auth_digest allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests (bsc#1284055).
• CVE-2026-79768: path equivalence issue in the mod_userdir module when configured with absolute non-wildcard UserDir directive (bsc#1284054).
• CVE-2026-93546: integer overflow in mod_dav_fs allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database (bsc#1284053).

This update for apache2 fixes the following issues:

• CVE-2026-42356: deployment of wrong handler allows target of internal redirects from CGI programs to also be treated as CGI and executed (bsc#1284043).
• CVE-2026-42528: memory calculation bug in mod_dav allows an attacker with permission to create WebDAV locks to crash server child processes (bsc#1284044).
• CVE-2026-46729: NULL pointer dereference in mod_heartmonitor over unicast listener (bsc#1284045).
• CVE-2026-47360: session cookie passed to a backend server when SessionCookieRemove changes across internal redirects (bsc#1284046).
• CVE-2026-48005: missing authentication checks in mod_auth_digest allows an unauthenticated remote client to cause a DoS via forged Authorization headers when Digest authentication is enabled with AuthDigestNcCheck (bsc#1284047).
• CVE-2026-56153: out-of-bounds write in mod_charset_lite (bsc#1284048).
• CVE-2026-56154: use-after-free in mod_rewrite when using lookahead (%{LA-U:HTTP:...}) (bsc#1284049).
• CVE-2026-57941: use-after-free in mod_http2 via shared session->bbtmp re-entrancy (bsc#1284050).
• CVE-2026-58415: internal state files accessible to external parties in mod_dav_fs allows a remote client to read WebDAV dead properties of resources it cannot author via a GET request for the .DAV state directory (bsc#1284051).
• CVE-2026-59797: improper privilege management in mod_ssl when using SSLRequire and file-related expressions (bsc#1284059).
• CVE-2026-63045: improper validation of FTP PASV reply address in mod_proxy_ftp allows an untrusted FTP server to cause a proxy to open a data connection to an arbitrary third-party host (bsc#1284060).
• CVE-2026-63292: stack-based buffer overflow in mod_vhost_alias allows a remote client to cause a DoS or potentially execute arbitrary code via an HTTP request with a specially crafted Host header (bsc#1284061).
• CVE-2026-63686: NULL pointer dereference in mod_xml2enc allows an untrusted backend server to cause a denial of service via a crafted proxied response (bsc#1284058).
• CVE-2026-63718: inconsistent interpretation of HTTP requests in mod_proxy_uwsgi allows for response smuggling via a crafted uwsgi response with Transfer-Encoding (bsc#1284057).
• CVE-2026-73636: authentication bypass by capture-replay in mod_auth_digest allows a MiTM attacker to replay captured digest authentication credentials via crafted requests (bsc#1284056).
• CVE-2026-73637: use-after-free in mod_auth_digest allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests (bsc#1284055).
• CVE-2026-79768: path equivalence issue in the mod_userdir module when configured with absolute non-wildcard UserDir directive (bsc#1284054).
• CVE-2026-93546: integer overflow in mod_dav_fs allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database (bsc#1284053).

이지웅 discovered that Apache HTTP Server exposed WebDAV property information. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-58415)

Zhen Kong and Charles Vosburgh discovered that Apache HTTP Server did not properly validate FTP server responses. A remote attacker could possibly use this issue to make a forward proxy connect to an arbitrary host. (CVE-2026-63045)

Hyojae Lee and Zhen Kong discovered that Apache HTTP Server incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-63292)

Lucian Nitescu and Zhen Kong discovered that Apache HTTP Server did not properly handle certain responses from backend servers. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-63686)

Qing Xu discovered that Apache HTTP Server incorrectly interpreted HTTP responses from backend servers. A remote attacker could possibly use this issue to perform HTTP response smuggling attacks. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-63718)

Hyojae Lee discovered that Apache HTTP Server did not properly validate Digest authentication requests. A machine-in-the-middle attacker could possibly use this issue to bypass authentication. (CVE-2026-73636)

Zhen Kong and Darren Carreras discovered that Apache HTTP Server did not properly manage authentication requests. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-73637)

Vlatko Kosturjak discovered that Apache HTTP Server did not properly enforce access restrictions for user directories. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-79768)

Zhen Kong discovered that Apache HTTP Server did not properly handle certain WebDAV requests. An authenticated user could possibly use this issue to cause a denial of service or corrupt WebDAV property data. (CVE-2026-93546)