Summary
Zhang San, Ankit Prateek, Zhen Kong, SeungHyun Cho, Ryoma Nishioka,
Keita Sode and Hyojae Lee discovered that Apache HTTP Server did not
correctly handle certain memory operations. An attacker could possibly
use this issue to cause a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-46729)
It was discovered that Apache HTTP Server did not correctly handle
certain session cookies. A remote attacker could possibly use this issue
to leak sensitive information. This issue only affected Ubuntu 14.04 LTS,
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS,
Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-47360)
Zhen Kong discovered that Apache HTTP Server did not correctly handle
certain forms of authentication. An unauthenticated remote attacker
could possibly use this issue to cause a denial of service. This issue
only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and
Ubuntu 26.04 LTS. (CVE-2026-48005)
Bartlomiej Dmitruk and Masumi Tanaka discovered that Apache HTTP Server
did not correctly handle certain memory operations. An attacker could
possibly use this issue to cause a denial of service or execute
arbitrary code. (CVE-2026-56153)
Lucian Nitescu discovered that Apache HTTP Server did not correctly
handle certain memory operations. An attacker could possibly use this
issue to cause a denial of service or execute arbitrary code. This issue
only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,
Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-56449)
It was discovered that Apache HTTP Server’s mod_rewrite module incorrectly
handled memory when performing certain variable lookups. A remote attacker
could possibly use this issue to cause a denial of service or execute
arbitrary code. This issue only affected Ubuntu 26.10. (CVE-2026-56154)
Lucian Nitescu, Simon Kappel, and Gianluca Danesin discovered that Apache
HTTP Server’s mod_http2 module incorrectly handled memory when processing
certain HTTP/2 connections. A remote attacker could possibly use this issue
to cause a denial of service or execute arbitrary code. This issue only
affected Ubuntu 26.10. (CVE-2026-57941)
Juthawong Naisanguansee, Charles Vosburgh, Mike Read, and Ryoma Nishioka
discovered that Apache HTTP Server’s mod_ssl module incorrectly handled
certain expressions. An attacker could possibly use this issue to bypass
intended access restrictions. This issue only affected Ubuntu 26.10.
(CVE-2026-59797)
이지웅 discovered that Apache HTTP Server exposed WebDAV property information.
A remote attacker could possibly use this issue to obtain sensitive
information. This issue only affected Ubuntu 26.10. (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.
This issue only affected Ubuntu 26.10. (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. This issue
only affected Ubuntu 26.10. (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. This issue
only affected Ubuntu 26.10. (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 26.10. (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. This issue only
affected Ubuntu 26.10. (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. This issue only affected
Ubuntu 26.10. (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. This issue only
affected Ubuntu 26.10. (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. This
issue only affected Ubuntu 26.10. (CVE-2026-93546)
Fixed packages 8
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | apache2 | 2.4.52-1ubuntu4.26 |
| Ubuntu · 24.04 LTS 24.04:LTS | apache2 | 2.4.58-1ubuntu8.18 |
| Ubuntu · 26.04 LTS 26.04:LTS | apache2 | 2.4.66-2ubuntu2.7 |
| Ubuntu · 26.10 | apache2 | 2.4.68-1ubuntu6.1 |
| Ubuntu · Pro 14.04 LTS Pro:14.04:LTS | apache2 | 2.4.7-1ubuntu4.22+esm18 |
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | apache2 | 2.4.18-2ubuntu3.17+esm23 |
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | apache2 | 2.4.29-1ubuntu4.27+esm14 |
| Ubuntu · Pro 20.04 LTS Pro:20.04:LTS | apache2 | 2.4.41-4ubuntu3.23+esm10 |
Vulnerabilities 17
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Critical 9.8
Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}
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.
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Critical 9.8
Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
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.
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Critical 9.8
Apache HTTP Server: mod_ssl SSLRequire allows .htaccess ap_expr file-function
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.
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High 8.8
Apache HTTP Server: mod_dav_fs namespace overflow
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.
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High 8.1
Apache HTTP Server: mod_auth_digest one-time-nonce replay attack
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 trigge…
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High 7.5
Apache HTTP Server: mod_heartmonitor denial of service
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.
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High 7.5
Apache HTTP Server: mod_session: Session cookie not removed during internal redirect
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 af…
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High 7.5
Apache HTTP Server: mod_auth_digest reauthentication attack
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 w…
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High 7.5
Apache HTTP Server: mod_charset_lite: Heap overflow in finish_partial_char
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.
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High 7.5
Apache HTTP Server: mod_proxy_html: crash in dump_content
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.
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High 7.5
Apache HTTP Server: mod_proxy_ftp PASV address handling
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…
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High 7.5CVE-2026-63292 Public exploit
Apache HTTP Server: mod_vhost_alias stack overflow
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 ex…
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High 7.5CVE-2026-63686 Public exploit
Apache HTTP Server: mod_xml2enc crash on charset conversion failure
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…
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High 7.5
Apache HTTP Server: mod_proxy_uwsgi Transfer-Encoding response smuggling
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…
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High 7.3
Apache HTTP Server: mod_auth_digest DoS attack
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 AuthDigestNcC…
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Medium 5.3
Apache HTTP Server: mod_dav_fs property database read access
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 .DA…
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Medium 5.3
Apache HTTP Server: mod_userdir information disclosure
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 af…
References
-
report
https://ubuntu.com/security/CVE-2026-46729
-
report
https://ubuntu.com/security/CVE-2026-47360
-
report
https://ubuntu.com/security/CVE-2026-48005
-
report
https://ubuntu.com/security/CVE-2026-56153
-
report
https://ubuntu.com/security/CVE-2026-56154
-
report
https://ubuntu.com/security/CVE-2026-56449
-
report
https://ubuntu.com/security/CVE-2026-57941
-
report
https://ubuntu.com/security/CVE-2026-58415
-
report
https://ubuntu.com/security/CVE-2026-59797
-
report
https://ubuntu.com/security/CVE-2026-63045
-
report
https://ubuntu.com/security/CVE-2026-63292
-
report
https://ubuntu.com/security/CVE-2026-63686
-
report
https://ubuntu.com/security/CVE-2026-63718
-
report
https://ubuntu.com/security/CVE-2026-73636
-
report
https://ubuntu.com/security/CVE-2026-73637
-
report
https://ubuntu.com/security/CVE-2026-79768
-
report
https://ubuntu.com/security/CVE-2026-93546