A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy configuration. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1880 advisory.

    Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-29167)

    A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache     HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy     configuration.

    Users are recommended to upgrade to version 2.4.68, which fixes this issue. (CVE-2026-29170)

    A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an     untrusted backend.Users are recommended to upgrade to version 2.4.68, which fixes this issue.
    (CVE-2026-34355)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and     ProxyPassReverseCookie*

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-34356)

    A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to     directly manipulate trusted DAV property databases, potentially causing child process crashes.

    Users are recommended to upgrade to version 2.4.68, which fixes this issue. (CVE-2026-42535)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and     untrusted content

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-42536)

    Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response     languages.

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. (CVE-2026-43951)

    Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local     .htaccess authors to read files with the privileges of the httpd user.

    This issue affects Apache HTTP Server: from through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44119)

    Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled     OCSP server

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44185)

    Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache     HTTP Server with an attacker controlled backend FTP server.

    This issue affects undefined: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44186)

    Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration.

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44631)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of httpd installed on the remote host is prior to 2.4.68-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3379 advisory.

    Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-29167)

    A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache     HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy     configuration.

    Users are recommended to upgrade to version 2.4.68, which fixes this issue. (CVE-2026-29170)

    A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an     untrusted backend.Users are recommended to upgrade to version 2.4.68, which fixes this issue.
    (CVE-2026-34355)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and     ProxyPassReverseCookie*

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-34356)

    A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to     directly manipulate trusted DAV property databases, potentially causing child process crashes.

    Users are recommended to upgrade to version 2.4.68, which fixes this issue. (CVE-2026-42535)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and     untrusted content

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-42536)

    Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response     languages.

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. (CVE-2026-43951)

    Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local     .htaccess authors to read files with the privileges of the httpd user.

    This issue affects Apache HTTP Server: from through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44119)

    Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled     OCSP server

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44185)

    Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache     HTTP Server with an attacker controlled backend FTP server.

    This issue affects undefined: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44186)

    Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration.

    This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

    Users are recommended to upgrade to version 2.4.68, which fixes the issue. (CVE-2026-44631)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.68. It is, therefore, affected by multiple vulnerabilities:

- Use After Free vulnerability in Apache HTTP Server with mod_ldap in per-directory configuration. (CVE-2026-29167)

- A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation when listing FTP directory contents either via forward or reverse proxy configuration. (CVE-2026-29170)

- A buffer overflow in mod_proxy_html in Apache HTTP Server allows an attack by an untrusted backend. (CVE-2026-34355)

- Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie. (CVE-2026-34356)

- A path handling issue in mod_dav_fs allows a WebDAV content author to directly manipulate trusted DAV property databases, potentially causing child process crashes. (CVE-2026-42535)

- Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content. (CVE-2026-42536)

- Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. (CVE-2026-43951)

- Improper Privilege Management vulnerability in Apache HTTP Server allows local .htaccess authors to read files with the privileges of the httpd user. (CVE-2026-44119)

- Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP server. (CVE-2026-44185)

- Loop with Unreachable Exit Condition vulnerability in the mod_proxy_ftp module in Apache HTTP Server with an attacker controlled backend FTP server. (CVE-2026-44186)

- Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. (CVE-2026-44631)

- Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. (CVE-2026-48913)

- Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http2 leads to denial of service via malicious HTTP requests. (CVE-2026-49975)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4629 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4629-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Bastien Roucaris     June 12, 2026                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : apache2     Version        : 2.4.67-1~deb11u3     CVE ID         : CVE-2026-29167 CVE-2026-29170 CVE-2026-34355 CVE-2026-34356                      CVE-2026-42535 CVE-2026-42536 CVE-2026-43951 CVE-2026-44119                      CVE-2026-44185 CVE-2026-44186 CVE-2026-44631 CVE-2026-48913     Debian Bug     : 1139340

    Multiple vulnerabilities have been discovered in the Apache HTTP server,     which may result in remote code execution, privilege escalation, denial     of service or information disclosure.

    For Debian 11 bullseye, these problems have been fixed in version     2.4.67-1~deb11u3.

    We recommend that you upgrade your apache2 packages.

    For the detailed security status of apache2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/apache2

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 7655baae-637d-11f1-8607-8447094a420f advisory.

    The Apache httpd project reports:
    See links for details.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache     HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy     configuration. Users are recommended to upgrade to version 2.4.68, which fixes this issue.
    (CVE-2026-29170)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Apache httpd installed on the remote host is prior to 2.4.68. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.68 advisory.

  - CVE-2026-49975, also known as HTTP/2 Bomb, is a remote denial-of-service exploit against most major web     servers, including: nginx, Apache httpd, Microsoft IIS, Envoy, Cloudflare Pingor. The vulnerable behavior     exists in each server's default HTTP/2 configuration (CVE-2026-49975)

  - mod_xml2enc heap overflow: Heap-based Buffer Overflow vulnerability in Apache HTTP Server with     mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0     through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.
    Acknowledgements: finder: Zhenpeng (Leo) Lin at depthfirst (CVE-2026-42536)

  - OOB Read in `merge_response_headers` can cause crash: Out-of-bounds Read vulnerability in Apache HTTP     Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP     Server: from 2.4.0 through 2.4.67. Acknowledgements: finder: Zhenpeng (Leo) Lin at depthfirst     (CVE-2026-43951)

  - escalation of privilege through expressions in .htaccess in multiple modules: Improper Privilege     Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local .htaccess authors to read     files with the privileges of the httpd user. This issue affects Apache HTTP Server: from through 2.4.67.
    Users are recommended to upgrade to version 2.4.68, which fixes the issue. Acknowledgements:
    (CVE-2026-44119)

  - Stack Buffer Over-Read in mod_ssl OCSP `send_request`: Buffer Over-read vulnerability in Apache HTTP     Server via outbound OCSP requests to an attacker controlled OCSP server This issue affects Apache HTTP     Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the     issue. Acknowledgements: finder: Zhenpeng (Leo) Lin at depthfirst (CVE-2026-44185)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
322110	Amazon Linux 2023 : httpd, httpd-core, httpd-devel (ALAS2023-2026-1880)	Nessus	Amazon Linux Local Security Checks	critical
322004	Amazon Linux 2 : httpd, --advisory ALAS2-2026-3379 (ALAS-2026-3379)	Nessus	Amazon Linux Local Security Checks	critical
115263	Apache 2.4.x < 2.4.68 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	high
320880	Debian dla-4629 : apache2 - security update	Nessus	Debian Local Security Checks	critical
320010	FreeBSD : Apache httpd -- Multiple vulnerabilities (7655baae-637d-11f1-8607-8447094a420f)	Nessus	FreeBSD Local Security Checks	critical
319919	Linux Distros Unpatched Vulnerability : CVE-2026-29170	Nessus	Misc.	medium
319665	Apache 2.4.x < 2.4.68 Multiple Vulnerabilities	Nessus	Web Servers	high

Detections

Analytics

CVE-2026-29170

medium

Tenable Plugins

critical

critical

high

critical

critical

medium

high