SB2026103108 - Ubuntu update for apache2

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Main Vulnerability Database SB2026103108

SB2026103108 - Ubuntu update for apache2

Published: October 31, 2026

Security Bulletin ID SB2026103108
CSH Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 25% Medium 50% Low 25%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Improper access control (CVE-ID: CVE-2026-24072)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to improper access control in various Apache HTTP Server modules when evaluating ap_expr from .htaccess files. A local user can create a crafted .htaccess expression to disclose sensitive information.

The issue affects local .htaccess authors and allows reading files with the privileges of the httpd user.


2) Heap-based buffer overflow (CVE-ID: CVE-2026-28780)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service or potentially execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in mod_proxy_ajp ajp_msg_check_header() when processing AJP messages from a backend server. A remote attacker can send a specially crafted AJP message to cause a denial of service or potentially execute arbitrary code.

The malicious AJP server can cause 4 attacker-controlled bytes to be written past the end of a heap-based buffer.


3) NULL pointer dereference (CVE-ID: CVE-2026-29169)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in mod_dav_lock when handling requests. A remote attacker can send a malicious request to cause a denial of service.

mod_dav_lock is not used internally by mod_dav or mod_dav_fs, and the only known use-case mentioned is mod_dav_svn earlier than version 1.2.0.


4) Out-of-bounds read (CVE-ID: CVE-2026-34059)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to a heap over-read in mod_proxy_ajp ajp_parse_data() when processing AJP messages from a backend server. A remote attacker can send a specially crafted AJP message to disclose sensitive information.

Exploitation requires Apache HTTP Server to connect to an untrusted or compromised AJP backend server.


Remediation

Install update from vendor's website.

References