Apache Http Server vulnerabilities

CVE-2026-28780 [CRITICAL] CWE-122 CVE-2026-28780: Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp co Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66.

CVE-2026-29168 [HIGH] CWE-770 CVE-2026-29168: Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's  mod_md v Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's mod_md via OCSP response data. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2026-23918 [HIGH] CWE-415 CVE-2026-23918: Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This iss Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2026-24072 [HIGH] CWE-269 CVE-2026-24072: An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .ht An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess authors to read files with the privileges of the httpd user. Users are recommended to upgrade to version 2.4.67, which fixes this issue.

CVE-2026-29169 [HIGH] CWE-476 CVE-2026-29169: A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an att 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 mod_dav_svn from Apache Subversion earlier than version 1.2.0. Users are recommended to upgra

CVE-2026-34059 [HIGH] CWE-126 CVE-2026-34059: Buffer Over-read vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: throug Buffer Over-read vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2026-34032 [MEDIUM] CWE-125 CVE-2026-34032: Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server. This issue affec Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2026-33006 [MEDIUM] CWE-208 CVE-2026-33006: A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authe A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker. Users are recommended to upgrade to version 2.4.67, which fixes this issue.

CVE-2026-33007 [MEDIUM] CWE-476 CVE-2026-33007: A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a caching forward proxy configuration. Users are recommended to upgrade to version 2.4.67, which fixes this issue.

CVE-2026-33523 [MEDIUM] CWE-443 CVE-2026-33523: HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compr HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2026-33857 [MEDIUM] CWE-125 CVE-2026-33857: Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apach Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2025-55753 [HIGH] CWE-190 CVE-2025-55753: An integer overflow in the case of failed ACME certificate renewal leads, after a number of failures An integer overflow in the case of failed ACME certificate renewal leads, after a number of failures (~30 days in default configurations), to the backoff timer becoming 0. Attempts to renew the certificate then are repeated without delays until it succeeds. This issue affects Apache HTTP Server: from 2.4.30 before 2.4.66. Users are recommended to u

CVE-2025-58098 [HIGH] CWE-201 CVE-2025-58098: Apache HTTP Server 2.4.65 and earlier with Server Side Includes (SSI) enabled and mod_cgid (but not Apache HTTP Server 2.4.65 and earlier with Server Side Includes (SSI) enabled and mod_cgid (but not mod_cgi) passes the shell-escaped query string to #exec cmd="..." directives. This issue affects Apache HTTP Server before 2.4.66. Users are recommended to upgrade to version 2.4.66, which fixes the issue.

CVE-2025-59775 [HIGH] CWE-918 CVE-2025-59775: Server-Side Request Forgery (SSRF) vulnerability  in Apache HTTP Server on Windows with AllowEnc Server-Side Request Forgery (SSRF) vulnerability in Apache HTTP Server on Windows with AllowEncodedSlashes On and MergeSlashes Off allows to potentially leak NTLM hashes to a malicious server via SSRF and malicious requests or content Users are recommended to upgrade to version 2.4.66, which fixes the issue.

CVE-2025-65082 [MEDIUM] CWE-150 CVE-2025-65082: Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server th Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment variables set via the Apache configuration unexpectedly superseding variables calculated by the server for CGI programs. This issue affects Apache HTTP Server from 2.4.0 through 2.4.65. Users are recommended to upgrade to version 2

CVE-2025-66200 [MEDIUM] CWE-288 CVE-2025-66200: mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid. This issue affects Apache HTTP Server: from 2.4.7 through 2.4.65. Users are recommended to upgrade to version 2.4.66, which fixes th

CVE-2025-54090 [MEDIUM] CWE-253 CVE-2025-54090: A bug in Apache HTTP Server 2.4.64 results in all "RewriteCond expr ..." tests evaluating as "true". A bug in Apache HTTP Server 2.4.64 results in all "RewriteCond expr ..." tests evaluating as "true". Users are recommended to upgrade to version 2.4.65, which fixes the issue.

CVE-2025-23048 [CRITICAL] CWE-284 CVE-2025-23048: In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control byp In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to a different set of trusted client certificates (for example with a diffe

CVE-2024-42516 [HIGH] CVE-2024-42516: HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the 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 but the patch included in Apache HTTP Server 2.4.59 did not address the issue. Users are recommended t

CVE-2024-47252 [HIGH] CWE-150 CVE-2024-47252: Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allo Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging configuration where CustomLog is used with "%{varname}x" or "%{varname}c" to log variables provided by mod_ssl such as SSL_TLS_SNI, no escapi