The version of httpd installed on the remote host is prior to 2.4.67. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-124-01 advisory.

    New httpd packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the httpd 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 remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8239-1 advisory.

    Bartlomiej Dmitruk and Stanislaw Strzalkowski discovered that Apache HTTP Server incorrectly handled     certain memory operations when using the HTTP/2 protocol. A remote attacker could use this issue to cause     Apache HTTP Server to crash, resulting in a denial of service, or possibly execute arbitrary code. This     issue only affected Ubuntu 26.04 LTS. (CVE-2026-23918)

    It was discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain privileges. A     local attacker could possibly use this issue to obtain sensitive information. (CVE-2026-24072)

    Andrew Lacambra, Elhanan Haenel, Tianshuo Han, and Tristan Madani discovered that the Apache HTTP Server     mod_proxy_ajp module incorrectly handled certain AJP server messages. An attacker in control of a backend     AJP server could use this issue to cause Apache HTTP Server to crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2026-28780)

    Pavel Kohout discovered that Apache HTTP Server did not properly limit resource allocation in mod_md when     processing OCSP response data. A remote attacker could possibly use this issue to cause a denial of     service. (CVE-2026-29168)

    Pavel Kohout discovered that the Apache HTTP Server incorrectly handled certain memory operations in     mod_dav_lock. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash,     resulting in a denial of service. (CVE-2026-29169)

    Nitescu Lucian discovered that Apache HTTP Server had a timing attack vulnerability in mod_auth_digest. A     remote attacker could possibly use this issue to bypass Digest authentication. (CVE-2026-33006)

    Pavel Kohout and Arkadi Vainbrand discovered that Apache HTTP Server incorrectly handled certain memory     operations in mod_authn_socache. A remote attacker could possibly use this issue to cause Apache HTTP     Server to crash, resulting in a denial of service. (CVE-2026-33007)

    Haruki Oyama, Merih Mengisteab, and Dawit Jeong discovered that Apache HTTP Server had an HTTP response     splitting vulnerability in multiple modules when used with untrusted or compromised backend servers. An     attacker could possibly use this issue to inject arbitrary HTTP headers. (CVE-2026-33523)

    Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in     mod_proxy_ajp. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash,     resulting in a denial of service. (CVE-2026-33857)

    Tianshuo Han and Jrme Djouder discovered that Apache HTTP Server incorrectly handled certain string     operations in mod_proxy_ajp. A remote attacker could possibly use this issue to obtain sensitive     information. (CVE-2026-34032)

    Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in     mod_proxy_ajp. A remote attacker could use this issue to cause Apache HTTP Server to crash, resulting in a     denial of service, or possibly obtain sensitive information. (CVE-2026-34059)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Apache httpd installed on the remote host is prior to 2.4.67. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.67 advisory.

  - Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects     to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause     it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache     HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
    (CVE-2026-28780)

  - Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue     affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the     issue. (CVE-2026-23918)

  - An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess     authors to read files with the privileges of the httpd user. Users are recommended to upgrade to version     2.4.67, which fixes this issue. (CVE-2026-24072)

  - Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP     response data. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66. Users are recommended to     upgrade to version 2.4.67, which fixes the issue. (CVE-2026-29168)

  - A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker     to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.
    The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version     1.2.0. Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.
    (CVE-2026-29169)

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 1ccc383b-486a-11f1-8b62-8447094a420f advisory.

    The Apache httpd project reports:
    mod_proxy_ajp: CVE-2026-34059, CVE-2026-34032, CVE-2026-33857, CVE-2026-28780     multiple modules: CVE-2026-33523     mod_authn_socache: CVE-2026-33007     mod_auth_digest: CVE-2026-33006     mod_dav_lock: mod_dav_lock     mod_md: CVE-2026-29168     mod_rewrite: CVE-2026-24072     mod_http2: CVE-2026-23918

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 remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6248 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6248-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     May 06, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : apache2     CVE ID         : CVE-2026-23918 CVE-2026-24072 CVE-2026-28780 CVE-2026-29168                      CVE-2026-29169 CVE-2026-33006 CVE-2026-33007 CVE-2026-33523                      CVE-2026-33857 CVE-2026-34032 CVE-2026-34059     Debian Bug     : 1135737

    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 the oldstable distribution (bookworm), these problems have been fixed     in version 2.4.67-1~deb12u2.

    For the stable distribution (trixie), these problems have been fixed in     version 2.4.67-1~deb13u2. The fix for CVE-2026-23918 was already     included in the Debian 13.4 point release update versioned     2.4.66-1~deb13u2 to address reported HTTP/2 regressions.

    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 Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

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

  - Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects     to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause     it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache     HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
    (CVE-2026-28780)

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

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-3e32c54eab advisory.

    - new version 2.4.67

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

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

ID	Name	Product	Family	Published	Updated	Severity
312108	Slackware Linux 15.0 / current httpd Multiple Vulnerabilities (SSA:2026-124-01)	Nessus	Slackware Local Security Checks	5/4/2026	5/7/2026	critical
313207	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Apache HTTP Server vulnerabilities (USN-8239-1)	Nessus	Ubuntu Local Security Checks	5/8/2026	5/8/2026	critical
311940	Apache 2.4.x < 2.4.67 Multiple Vulnerabilities	Nessus	Web Servers	5/4/2026	5/8/2026	critical
312249	FreeBSD : www/apache24 -- Multiple vulnerabilities (1ccc383b-486a-11f1-8b62-8447094a420f)	Nessus	FreeBSD Local Security Checks	5/5/2026	5/7/2026	critical
312666	Debian dsa-6248 : apache2 - security update	Nessus	Debian Local Security Checks	5/6/2026	5/6/2026	critical
312354	Linux Distros Unpatched Vulnerability : CVE-2026-28780	Nessus	Misc.	5/6/2026	5/7/2026	critical
314241	Fedora 44 : httpd (2026-3e32c54eab)	Nessus	Fedora Local Security Checks	5/11/2026	5/11/2026	critical

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