RHSA-2026:66323 - Security Advisory

Topic

An update for httpd is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: incomplete fix for CVE-2023-38709 (CVE-2024-42516)
• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
• httpd: NULL pointer dereference via specially crafted request (CVE-2026-29169)
• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)
• httpd: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap per-directory configuration (CVE-2026-29167)
• httpd: Apache HTTP Server: Heap-based Buffer Overflow via malicious backend servers (CVE-2026-34356)
• httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server (CVE-2026-44185)
• httpd: Apache HTTP Server: Denial of Service via crafted regular expressions (CVE-2026-44631)
• httpd: Apache HTTP Server: Denial of Service in mod_proxy_ftp via attacker-controlled FTP server (CVE-2026-44186)
• httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc (CVE-2026-42536)
• httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass (CVE-2026-34355)
• httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server - AUS 9.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x

Fixes

• BZ - 2374549 - CVE-2024-42516 httpd: incomplete fix for CVE-2023-38709
• BZ - 2464940 - CVE-2026-34059 httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()
• BZ - 2464952 - CVE-2026-34032 httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check
• BZ - 2464953 - CVE-2026-33857 httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions
• BZ - 2465296 - CVE-2026-29169 httpd: NULL pointer dereference via specially crafted request
• BZ - 2465299 - CVE-2026-33007 httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash
• BZ - 2466913 - CVE-2026-28780 Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow
• BZ - 2486394 - CVE-2026-29167 httpd: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap per-directory configuration
• BZ - 2486395 - CVE-2026-34356 httpd: Apache HTTP Server: Heap-based Buffer Overflow via malicious backend servers
• BZ - 2486397 - CVE-2026-44185 httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server
• BZ - 2486399 - CVE-2026-44631 httpd: Apache HTTP Server: Denial of Service via crafted regular expressions
• BZ - 2486402 - CVE-2026-44186 httpd: Apache HTTP Server: Denial of Service in mod_proxy_ftp via attacker-controlled FTP server
• BZ - 2486411 - CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
• BZ - 2486414 - CVE-2026-34355 httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass
• BZ - 2486415 - CVE-2026-43951 httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime

CVEs

• CVE-2024-42516
• CVE-2026-28780
• CVE-2026-29167
• CVE-2026-29169
• CVE-2026-33007
• CVE-2026-33857
• CVE-2026-34032
• CVE-2026-34059
• CVE-2026-34355
• CVE-2026-34356
• CVE-2026-42536
• CVE-2026-43951
• CVE-2026-44185
• CVE-2026-44186
• CVE-2026-44631

References

• https://access.redhat.com/security/updates/classification/#important