SB20260721147 - Red Hat Enterprise Linux 8 update for the httpd:2.4 module
Published: July 21, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 10 vulnerabilities.
1) HTTP response splitting (CVE-ID: CVE-2023-38709)
CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform HTTP splitting attacks.
The vulnerability exists due to software does not correctly process CRLF character sequences. A malicious or exploitable backend/content generators can send specially crafted response containing CRLF sequence and make the application to send a split HTTP response.
Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.
2) HTTP response splitting (CVE-ID: CVE-2024-42516)
CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')
CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to perform HTTP splitting attacks.
The vulnerability exists due to software does not correctly process CRLF character sequences. A remote attacker with ability to manipulate the Content-Type response headers of applications hosted or proxied by the server can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.
Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.
Note, this vulnerability exists due a missing fix for #VU88151 (CVE-2023-38709).
3) NULL pointer dereference (CVE-ID: CVE-2026-29169)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 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/E:U/U:Green
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) Heap-based buffer overflow (CVE-ID: CVE-2026-34356)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in ProxyPassReverseCookie* processing when interacting with malicious backend servers. A remote attacker can operate a malicious backend server to execute arbitrary code.
5) Out-of-bounds read (CVE-ID: CVE-2026-44185)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in mod_ssl OCSP send_request when sending outbound OCSP requests to an attacker-controlled OCSP server. A remote attacker can operate a malicious OCSP server to disclose sensitive information.
6) Out-of-bounds write (CVE-ID: CVE-2026-44631)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to out-of-bounds write in ap_regname when processing crafted regular expressions in the configuration. A local user can place crafted regular expressions in the configuration to cause a denial of service.
7) Infinite loop (CVE-ID: CVE-2026-44186)
CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an infinite loop in proxy_ftp_handler in mod_proxy_ftp when interacting with an attacker-controlled backend FTP server. A remote attacker can operate a malicious backend FTP server to cause a denial of service.
8) Heap-based buffer overflow (CVE-ID: CVE-2026-42536)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in mod_xml2enc xml2StartParse when parsing untrusted content. A remote attacker can supply crafted content to execute arbitrary code.
9) Buffer overflow (CVE-ID: CVE-2026-34355)
CWE-ID: CWE-120 - Buffer overflow
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to buffer overflow in mod_proxy_html when processing content from an untrusted backend. A remote attacker can operate an untrusted backend to cause a denial of service.
10) Out-of-bounds read (CVE-ID: CVE-2026-43951)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds read in merge_response_headers when processing responses with mod_headers, mod_mime, and multiple response languages. A remote attacker can trigger processing of affected responses to cause a denial of service.
The issue occurs when mod_headers and mod_mime are used with multiple response languages.
Remediation
Install update from vendor's website.