CVE-2026-42356

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.

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.

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.

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.

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.

• 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-2026-42356: do not propagate the trusted content-type flag to the target of an internal redirect from a CGI, so it is not run with the wrong handler

• CVE-2026-42356: fix execution of the target of a local redirect from a CGI script as a CGI script

• SECURITY UPDATE: wrong handler on internal redirect from a CGI program
  • debian/patches/CVE-2026-42356.patch: do not propagate the trusted content-type flag to the target of an internal redirect in ap_internal_redirect_handler() in modules/http/http_request.c.
  • CVE-2026-42356

• SECURITY UPDATE: wrong handler on internal redirect from a CGI program
  • debian/patches/CVE-2026-42356.patch: do not propagate the trusted content-type flag to the target of an internal redirect in ap_internal_redirect_handler() in modules/http/http_request.c.
  • CVE-2026-42356

• CVE-2026-42356: do not run the target of a CGI internal redirect with the handler derived from the CGI request's trusted content type
• CVE-2026-63686: fix mod_xml2enc NULL pointer dereference when a charset conversion partially succeeds and then fails
• CVE-2026-63718: fix mod_proxy_uwsgi response smuggling via backend Transfer-Encoding by dropping hop-by-hop response headers
• CVE-2026-73636: fix mod_auth_digest one-time nonce replay
• CVE-2026-73637: fix mod_auth_digest use-after-free of shared client entries on concurrent requests
• CVE-2026-48005: fix mod_auth_digest forced re-authentication via forged Authorization headers with AuthDigestNcCheck
• mod_auth_digest: configs using "AuthDigestQop none" or the "authdigest-opaque" Mutex type no longer start (the shipped manual still documents "AuthDigestQop none"); 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)

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).