Red Hat Security Advisory: httpd:2.4 security update

Fixed packages 44

Vulnerabilities 9

• Critical 9.8
  CVE-2026-44631

  Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow

  Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. 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.

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026
• High 7.5
  CVE-2024-42516

  Apache HTTP Server: HTTP response splitting

  HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the Content-Type response headers of applications hosted or proxied by the server can split the HTTP response. This vulnerability was described as CVE-2023-38709 b…

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jul 10, 2025
• High 7.5
  CVE-2026-29169

  Apache HTTP Server: mod_dav_lock indirect lock crash

  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 m…

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  May 4, 2026
• High 7.5
  CVE-2026-34355

  Apache HTTP Server: mod_proxy_html buffer overflow

  A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted backend. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026
• High 7.5
  CVE-2026-34356

  Apache HTTP Server: ProxyPassReverseCookieMap buffer overflow

  Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassReverseCookie* 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 iss…

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026
• High 7.5
  CVE-2026-42536 Public exploit

  Apache HTTP Server: 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.

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026
• High 7.3
  CVE-2026-44185

  Apache HTTP Server: 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.

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026
• High 7.3
  CVE-2026-44186

  Apache HTTP Server: Loop in `proxy_ftp_handler` in mod_proxy_ftp

  Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTTP Server with an attacker controlled backend FTP server. This issue affects undefined: from 2.4.0 through 2.4.67. Users are recommended to upgrade to…

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026
• Medium 6.5
  CVE-2026-43951

  Apache HTTP Server: 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.

  Apache Software Foundation Apache HTTP Server apache2 apache2 Debian Ubuntu Azure Linux Alpine
  Jun 8, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2374549
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2465296
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486395
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486397
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486399
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486402
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486411
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486414
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2486415
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_99513.json
• report
  https://access.redhat.com/security/cve/CVE-2024-42516
• advisory
  https://www.cve.org/CVERecord?id=CVE-2024-42516
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2024-42516
• article
  https://httpd.apache.org/security/vulnerabilities_24.html
• report
  https://access.redhat.com/security/cve/CVE-2026-29169
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-29169
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-29169
• report
  https://access.redhat.com/security/cve/CVE-2026-34355
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-34355
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-34355
• report
  https://access.redhat.com/security/cve/CVE-2026-34356
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-34356
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-34356
• report
  https://access.redhat.com/security/cve/CVE-2026-42536
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-42536
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-42536
• report
  https://access.redhat.com/security/cve/CVE-2026-43951
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-43951
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-43951
• report
  https://access.redhat.com/security/cve/CVE-2026-44185
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-44185
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-44185
• report
  https://access.redhat.com/security/cve/CVE-2026-44186
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-44186
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-44186
• report
  https://access.redhat.com/security/cve/CVE-2026-44631
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-44631
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-44631