Метка: httpd

Apache httpd 2.4.68 with Brotli support, TLS 1.3, OpenSSL 4.0.0 with http2 mod_http2 2.0.42 and ALPN for Red Hat Enterprise Linux, CentOS 7, Alma Linux, Rocky Linux 8/9/10

Apache httpd 2.4.68 RPMs released and added to all supported platforms.

Major changes:

 *) SECURITY: CVE-2026-49975: mod_http2 denial of service
     (cve.mitre.org)
     Memory Allocation with Excessive Size Value vulnerability in
     Apache HTTP Server's mod_http leads to denial of service via
     malicious HTTP requests.
     This issue affects Apache HTTP Server: from 2.4.17 through
     2.4.67.
     Credits: Quang Luong of Calif.IO in collaboration with OpenAI
     Codex

  *) SECURITY: CVE-2026-48913: mod_http2 memory corruption when file
     handles exhausted (cve.mitre.org)
     Use After Free vulnerability in Apache HTTP Server module
     mod_http2 when file handles are already exhausted.
     This issue affects Apache HTTP Server: from 2.4.55 through
     2.4.67.
     Credits: Sam Lovejoy, IBM X-Force Offensive Research (XOR)

  *) SECURITY: CVE-2026-44631: Heap Underflow in `ap_regname` via
     Signed Char Overflow (cve.mitre.org)
     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.
     Credits: Zhenpeng (Leo) Lin at depthfirst

  *) SECURITY: CVE-2026-44186: Loop in `proxy_ftp_handler` in
     mod_proxy_ftp (cve.mitre.org)
     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 version 2.4.68, which fixes
     the issue.
     Credits: Zhenpeng (Leo) Lin at depthfirst

  *) SECURITY: CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP
     `send_request` (cve.mitre.org)
     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.
     Credits: Zhenpeng (Leo) Lin at depthfirst

  *) SECURITY: CVE-2026-44119: escalation of privilege through
     expressions in .htaccess in multiple modules (cve.mitre.org)
     Improper Privilege Management vulnerability in Apache HTTP
     Server 2.4.67 and earlier allows local .htaccess authors to read
     files with the privileges of the httpd user.
     This issue affects Apache HTTP Server: from through 2.4.67.
     Users are recommended to upgrade to version 2.4.68, which fixes
     the issue.
     Credits: Lucian Nitescu

  *) SECURITY: CVE-2026-43951: OOB Read in `merge_response_headers`
     can cause crash (cve.mitre.org)
     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.
     Credits: Zhenpeng (Leo) Lin at depthfirst

  *) SECURITY: CVE-2026-42536: mod_xml2enc heap overflow
     (cve.mitre.org)
     Heap-based Buffer Overflow vulnerability in Apache HTTP Server
     withВ 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.
     Credits: Zhenpeng (Leo) Lin at depthfirst

  *) SECURITY: CVE-2026-42535: mod_dav_fs protected directory access
     (cve.mitre.org)
     A path handling issue in mod_dav_fs in Apache 2.4.67 and
     earlierВ allows a WebDAV content author to directly manipulate
     trusted DAV property databases, potentially causing child
     process crashes.
     Users are recommended to upgrade to version 2.4.68, which fixes
     this issue.
     Credits: Zhenpeng (Leo) Lin at depthfirst

  *) SECURITY: CVE-2026-34356: ProxyPassReverseCookieMap buffer
     overflow (cve.mitre.org)
     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 issue.
     Credits: Arkadi Vainbrand

  *) SECURITY: CVE-2026-34355: mod_proxy_html buffer overflow
     (cve.mitre.org)
     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.
     Credits: Elhanan Haenel

  *) SECURITY: CVE-2026-29170: mod_proxy_ftp XSS (cve.mitre.org)
     A cross-site scripting vulnerability exists in mod_proxy_ftp's
     HTML directory list generation in Apache HTTP Server 2.4.67 and
     earlier when listing FTP directory contents either via forward
     or reverse proxy configuration.
     Users are recommended to upgrade to version 2.4.68, which fixes
     this issue.
     Credits: Pavel Kohout, Aisle Research, Aisle.com

  *) SECURITY: CVE-2026-29167: mod_ldap per-dir use-after-free
     (cve.mitre.org)
     Use After Free vulnerability in Apache HTTP Server with mod_ldap
     in per-directory 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.
     Credits: Pavel Kohout, Aisle Research, Aisle.com

  *) mod_ssl, ab: Add support for OpenSSL 4.0.  [Joe Orton]

  *) mod_ssl: Add SerialNumber as a recognized attribute type for SSL
     distinguished name variables.  [Michael Osipov <michaelo apache.org>,
     Benjamin Demarteau <benjamin.demarteau liege.be>]

  *) mod_ssl: Set auth type to "ClientCert" when client certificate authentication
     has been performed.  [Michael Osipov <michaelo apache.org>]

  *) mod_include: Don't print any of if/elsif/else content when
     a conditional evaluation returns an error. [Eric Covener]

  *) mod_unixd: CoreDumpDirectory requires enabling tracing on FreeBSD 11+.
     PR 65819.  [David CARLIER <devnexen gmail.com>]

  *) mod_file_cache: Fix crashes for mmap'ed files under threaded
     MPMs. PR 69901. barr.israel <barr.israel campus.technion.ac.il>

  *) core: Add support for %{m}t in ErrorLogFormat to log milli-second
     time resolution (in addition to existing %{u}t for micro-seconds).
     [LuboЕЎ Uhliarik <luhliari redhat.com>]

  *) mod_unixd: Drop test that effective user ID is zero in
     a chroot configuration.  PR 69767.
     [Bastien Roucaries <rouca debian.org>]

  *) mod_proxy_balancer: Include nonce in XML output.  PR 63074.
     Federico Mennite <federico.mennite lifeware.ch>

  *) mod_http2: update to version 2.0.42
     Fix excessive file description use for non-TLS frontend connections when
     sending files. Fixes <https://github.com/icing/mod_h2/issues/325>
     [Stefan Eissing]

  *) mod_http2: update to version 2.0.41
     Fix cookie header accounting against LimitRequestFields.
     [Stefan Eissing]

  *) mod_http2: update to version 2.0.40
     Fix error handling on upload requests when server runs out of file
     handles that left beam bucket callbacks in place, potentially using
     no longer valid references. Only applies on platforms with pipes
     and file descriptor limits not healthy for a network server.
     [Stefan Eissing]

  *) mod_dav_fs: Return a 404 for DELETE if deletion fails because the
     resource no longer exists.  PR 60746.  [Joe Orton]

  *) mod_proxy_hcheck: Fix healthcheck disabled due to child restart while
     updating. [Yann Ylavic]

Fixed vulnerabilities:

— SECURITY: CVE-2026-49975: mod_http2 denial of service — SECURITY: CVE-2026-48913: mod_http2 memory corruption when file — SECURITY: CVE-2026-44631: Heap Underflow in `ap_regname` via — SECURITY: CVE-2026-44186: Loop in `proxy_ftp_handler` in — SECURITY: CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP — SECURITY: CVE-2026-44119: escalation of privilege through — SECURITY: CVE-2026-43951: OOB Read in `merge_response_headers` — SECURITY: CVE-2026-42536: mod_xml2enc heap overflow — SECURITY: CVE-2026-42535: mod_dav_fs protected directory access — SECURITY: CVE-2026-34356: ProxyPassReverseCookieMap buffer — SECURITY: CVE-2026-34355: mod_proxy_html buffer overflow — SECURITY: CVE-2026-29170: mod_proxy_ftp XSS (cve.mitre.org) — SECURITY: CVE-2026-29167: mod_ldap per-dir use-after-free

HTTP/2 Bomb: why Apache httpd users should update mod_http2

A new HTTP/2 denial-of-service technique, called HTTP/2 Bomb, was publicly described by Calif on June 2, 2026. The attack abuses a combination of HTTP/2 header compression behavior and stalled response flow control to make a server allocate and hold a large amount of memory from a very small amount of network traffic. According to the research, the issue affects several major HTTP/2 implementations, including Apache httpd, nginx, Microsoft IIS, Envoy, and Cloudflare Pingora.

For Apache httpd, the vulnerable component is mod_http2. The researchers reported that Apache httpd could reach very high memory amplification under this attack pattern, because repeated HTTP/2 cookie header fragments were not counted correctly against request header limits. The public mitigation note says that the Apache-side fix is available in mod_http2 2.0.41 and later, while it was not yet part of an Apache httpd 2.4.x release at the time of publication.

The important practical detail is that you do not need to wait for a full Apache httpd package update if your distribution provides mod_http2 as a separate package. In the CodeIT repository, the update is already available separately from the main httpd package. The fix was included by the upstream mod_http2 authors in 2.0.41, and the CodeIT repository already provides the newer mod_http2 2.0.42 package. GitHub release notes for mod_http2 confirm that 2.0.41 fixed cookie header accounting against LimitRequestFields, while 2.0.42 is the latest following release.

What should administrators do?

If you use Apache httpd with HTTP/2 enabled on RHEL, AlmaLinux, Rocky Linux, Oracle Linux, CentOS, or compatible Enterprise Linux systems, update the mod_http2 package from the CodeIT repository:

dnf update mod_http2

or on older systems:

yum update mod_http2

Then reload or restart Apache httpd:

systemctl restart httpd

You can verify the installed package version with:

rpm -q mod_http2

The expected safe version in the CodeIT repository is 2.0.42 or newer.

Temporary mitigation

If you cannot update immediately, the safest temporary mitigation is to disable HTTP/2 and serve traffic over HTTP/1.1 only. For Apache httpd this can be done by removing h2 from the Protocols directive, for example:

Protocols http/1.1

However, disabling HTTP/2 is only a workaround. The recommended solution is to update mod_http2.

CodeIT repository status

CodeIT packages are built for Enterprise Linux systems that need modern web server components while keeping a stable operating system base. The HTTP/2 Bomb fix is already available in the CodeIT repository through mod_http2 2.0.42, independently from the main Apache httpd package. This allows administrators to patch the HTTP/2 module quickly without waiting for the next full httpd release cycle.

mod_http2 v2.0.40 rpms released

mod_http2 v2.0.40 rpms released and added to all supported platforms.

Changes:

  • Fix error handling on upload requests when server runs out of file handles that left beam bucket callbacks in place, potentially using no longer valid references. Only applies on platforms with pipes and file descriptor limits not healthy for a network server.

Apache httpd 2.4.67 with Brotli support, TLS 1.3, OpenSSL 4.0.0 with http2 mod_http2 2.0.39 and ALPN for Red Hat Enterprise Linux, CentOS 7, Alma Linux, Rocky Linux 8/9/10

Apache httpd 2.4.67 RPMs released and added to all supported platforms.

Major changes:

  *) SECURITY: CVE-2026-34059: Apache HTTP Server: mod_proxy_ajp:
     Heap Over-Read and memory disclosure in  ajp_parse_data()
     (cve.mitre.org)
     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.
     Credits: Elhanan Haenel

  *) SECURITY: CVE-2026-34032: Apache HTTP Server: mod_proxy_ajp:
     Heap Buffer Over-Read Due to Missing Null-Termination Check
     (ajp_msg_get_string) (cve.mitre.org)
     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.
     Credits: Tianshuo Han (<[email protected]>)

  *) SECURITY: CVE-2026-33857: Apache HTTP Server: Off-by-one OOB
     reads in AJP getter functions (cve.mitre.org)
     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.
     Credits: Elhanan Haenel

  *) SECURITY: CVE-2026-33523: Apache HTTP Server: multiple modules:
     HTTP response splitting forwarding malicious status line
     (cve.mitre.org)
     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.
     Credits: Haruki Oyama (Waseda University)

  *) SECURITY: CVE-2026-33007: Apache HTTP Server: mod_authn_socache
     crash (cve.mitre.org)
     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.
     Credits: Pavel Kohout, Aisle Research, Aisle.com

  *) SECURITY: CVE-2026-33006: Apache HTTP Server: mod_auth_digest
     timing attack (cve.mitre.org)
     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.
     Credits: Nitescu Lucian

  *) SECURITY: CVE-2026-29169: Apache HTTP Server: mod_dav_lock
     indirect lock crash (cve.mitre.org)
     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 upgrade to version 2.4.66, which fixes
     this issue, or remove mod_dav_lock.
     Credits: Pavel Kohout, Aisle Research, Aisle.com

  *) SECURITY: CVE-2026-29168: Apache HTTP Server: mod_md
     unrestricted OCSP response (cve.mitre.org)
     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.
     Credits: Pavel Kohout, Aisle Research, Aisle.com

  *) SECURITY: CVE-2026-28780: Apache HTTP Server: buffer overflow in
     mod_proxy_ajp via  ajp_msg_check_header() (cve.mitre.org)
     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.
     Users are recommended to upgrade to version 2.4.67, which fixes
     the issue.
     Credits: Andrew Lacambra

  *) SECURITY: CVE-2026-24072: Apache HTTP Server: mod_rewrite
     elevation of privileges via ap_expr (cve.mitre.org)
     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.
     Credits: y7syeu

  *) SECURITY: CVE-2026-23918: Apache HTTP Server: http2: double free
     and possible RCE on early reset (cve.mitre.org)
     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.
     Credits: Bartlomiej Dmitruk, striga.ai

  *) mod_md: update to version 2.6.10
     - Fix issue #420 <https://github.com/icing/mod_md/issues/420> by ignoring
       job.json files that claim to have completely finished a certificate
       renewal, but have not produced the necessary result files.

  *) mod_http2: update to version 2.0.39
     Remove streams own memory allocator after reports of memory problems
     with third party modules.
     [Stefan Eissing]

  *) mod_http2: update to version 2.0.38
     Source sync with mod_h2 github repository. No functional change.
     [Stefan Eissing]

  *) Updated conf/mime.types: added vnd.sqlite3, HEIC, HEIF
     [Alexandru Mărășteanu <hello alexei.ro>]

  *) mod_md: update to version 2.6.7
     - Fix a regression in `MDStapleOthers` which broke in v2.6.0 and no longer
       applied, no matter the configuration.

  *) mod_md: update to version 2.6.9
     - Pebble 2.9+ reports another error when terms of service agreement is
       not set. Treating all "userActionRequired" errors as permanent now.

  *) mod_md: update to version 2.6.8
     - Fix the ARI related `replaces` property in ACME order creation to only
       be used when the CA supports ARI and it is enabled in the menu config.
     - Fix compatibility with APR versions before 1.6.0 which do not have
       `apr_cstr_casecmp` and should use `apr_strnatcasecmp` instead.

  *) mod_http2: update to version 2.0.37
     Prevent double purge of a stream, resulting in a double free.
     Fixes PR 69899.
     [Stefan Eissing]

  *) mod_md: Use correct function name when compiling against APR < 1.6.0.
     PR 69954 [Tần Quảng <[email protected]>]

Encrypted Client Hello Comes to NGINX

We are rebuilding all the packages against openssl 4.0.0 that was released today.

Our nghttp2 (as builds test tool and httpd prerequisite) pull request was accepted some days ago, so it is no more a blocker.

Nginx 1.28.x was a blocker, but team finally released nginx 1.30 with ECH support and now all the stack builds with openssl 4.

Small exception is httpd that requires some patches to fix openssl 4 build (as api changed), it will be published as openssl4.patch in src.rpm separately.