Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.67.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2735-1 advisory.

    This update for apache2 fixes the following issues

    - CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
    - CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
    - CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
    - CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
    - CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
    - CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
    - CVE-2026-43951: out-of-bound read in `merge_response_headers` can cause crash (bsc#1267963).
    - CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
    - CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP `send_request` (bsc#1267969).
    - CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a     denial of       service (bsc#1267970).
    - CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
    - CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-     free       (bsc#1267972).
    - CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2717-1 advisory.

    This update for apache2 fixes the following issues

    - CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
    - CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
    - CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
    - CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
    - CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
    - CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
    - CVE-2026-43951: out-of-bound read in `merge_response_headers` can cause crash (bsc#1267963).
    - CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
    - CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP `send_request` (bsc#1267969).
    - CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a     denial of       service (bsc#1267970).
    - CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
    - CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-     free       (bsc#1267972).
    - CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

Tenable has extracted the preceding description block directly from the SUSE 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 AlmaLinux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the ALSA-2026:34355 advisory.

    * httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code     execution or denial of service. (CVE-2026-48913)
      * httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)


    Bug Fix(es) and Enhancement(s):

      * address CVE-2026-43951 and CVE-2026-48913 in mod_http2 (JIRA:AlmaLinux-188008)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:34355 advisory.

    The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4     servers.

    Security Fix(es):

    * httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code     execution or denial of service. (CVE-2026-48913)

    * httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)

    Bug Fix(es) and Enhancement(s):

    * address CVE-2026-43951 and CVE-2026-48913 in mod_http2 (JIRA:RHEL-188008)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2686-1 advisory.

    This update for apache2 fixes the following issues

    - CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
    - CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
    - CVE-2026-28780: heap buffer overflow in `mod_proxy_ajp` via `ajp_msg_check_header()` (bsc#1264163).
    - CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
    - CVE-2026-29168: allocation of resources without limits in `mod_md` via OCSP response (bsc#1264150).
    - CVE-2026-29169: NULL pointer dereference in `mod_dav_lock` allows server crash via malicious requests     (bsc#1263956).
    - CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
    - CVE-2026-33006: `mod_auth_digest` timing attack allows bypass of Digest authentication (bsc#1263955).
    - CVE-2026-33007: NULL pointer dereference in `mod_authn_socache` allows unauthenticated remote user to     crash a child       processes (bsc#1263954).
    - CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
    - CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
    - CVE-2026-34032: heap buffer overread in `mod_proxy_ajp` due to missing null-termination check     (bsc#1263951).
    - CVE-2026-34059: heap buffer overread and memory disclosure via `ajp_parse_data()` (bsc#1263950).
    - CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
    - CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
    - CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
    - CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
    - CVE-2026-43951: out-of-bound read in `merge_response_headers` can cause crash (bsc#1267963).
    - CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
    - CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP `send_request` (bsc#1267969).
    - CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a     denial of       service (bsc#1267970).
    - CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
    - CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-     free       (bsc#1267972).
    - CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

    Non security issue:

    - Update to 2.4.66 (jsc#PED-16334).

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1859 advisory.

    Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already     exhausted.

    This issue affects Apache HTTP Server: from 2.4.55 through 2.4.67. (CVE-2026-48913)

    Denial of service in HTTP/2 cookie request header counting (CVE-2026-49975)

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.

An update of the httpd package has been released.

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.

  - Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already     exhausted. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.67. (CVE-2026-48913)

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
325031	SUSE SLES15: apache2 / apache2-devel / apache2-manual / apache2-prefork / etc (SUSE-SU-2026:2735-1)	Nessus	SuSE Local Security Checks	high
324837	SUSE SLES12: apache2 / apache2-devel / apache2-doc / apache2-example-pages / etc (SUSE-SU-2026:2717-1)	Nessus	SuSE Local Security Checks	high
324727	AlmaLinux 10 : mod_http2 (ALSA-2026:34355)	Nessus	Alma Linux Local Security Checks	high
324570	RHEL 10 : mod_http2 (RHSA-2026:34355)	Nessus	Red Hat Local Security Checks	high
324047	SUSE SLES15: apache2 / apache2-devel / apache2-doc / apache2-prefork / etc (SUSE-SU-2026:2686-1)	Nessus	SuSE Local Security Checks	high
322019	Amazon Linux 2023 : mod_http2 (ALAS2023-2026-1859)	Nessus	Amazon Linux Local Security Checks	high
115263	Apache 2.4.x < 2.4.68 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	high
321208	Photon OS 5.0: Httpd PHSA-2026-5.0-0881	Nessus	PhotonOS Local Security Checks	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
319913	Linux Distros Unpatched Vulnerability : CVE-2026-48913	Nessus	Misc.	high
319665	Apache 2.4.x < 2.4.68 Multiple Vulnerabilities	Nessus	Web Servers	high

Detections

Analytics

CVE-2026-48913

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Tenable Plugins

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