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Apache Fixes Critical HTTP/2 Vulnerability: What Website Owners Need to Check

CVE-2026-119618, which allows remote code execution, has been patched in Apache HTTP Server 2.4.71. It is essential to verify mod_http2, the provider package, and running processes.

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On November 11, 2026, the Apache HTTP Server project released version 2.4.71 with a fix for the critical CVE-2026-119618 vulnerability in the HTTP/2 module. If your website or online store is served by Apache, ask your administrator to check the module in use and confirm the patch is applied. For shared hosting, address this issue with your provider; for VPS and dedicated servers, contact the responsible maintenance team.

What is known about the vulnerability

Apache classifies the issue as critical: a synchronization error during parallel processing in mod_http2 can lead to memory corruption and remote code execution. The bulletin lists Apache HTTP Server versions from 2.4.55 to 2.4.70 inclusive. The fix was included in version 2.4.71.

For the separately distributed mod_h2 via GitHub, a separate range of affected releases is specified: 2.0.8–2.0.42. If the module was installed separately, its origin and the patch status must be verified independently from the main web server package.

Red Hat clarifies: the vulnerability affects servers with HTTP/2 enabled. The vendor reports a demonstration of a working exploit in a public study; this is not equivalent to confirmed attacks on live sites. There is no basis for declaring all affected sites compromised. The Apache bulletin does not specify geographic restrictions.

The assessment depends on the package. Red Hat rates its mod_http2 for RHEL 9 and 10 as Important because memory allocation specifics complicate exploitation, and notes that RHEL 8 and earlier releases are unaffected. This statement applies to Red Hat packages: it cannot be automatically transferred to a third-party build or a separately installed module.

What to request be checked

  • Verify whether Apache handles requests for each site and whether mod_http2 is in use. A CDN or another server in front of Apache does not by itself confirm the security of the internal component.
  • Specify the package source and the full build number. A Linux distribution or support provider may backport a fix into a package with an older base version number; request its bulletin and confirmation of the CVE closure.
  • Coordinate the installation of the supported fix and any required restarts. It is critical that running processes use the update, not just the package files on disk.
  • After the work, check login, forms, file uploads, the shopping cart, checkout, and the integrations used. Select checks based on the features of your project.

Before changing the configuration, save a backup and prepare a recovery plan. Do not manually replace packages or disable protocols with a single command without evaluating dependencies. If the update is not yet available, request temporary measures from the provider specifically for this vulnerability and your configuration.

What result should be considered sufficient

Request a brief confirmation: which Apache instances have been checked, which package fixed CVE-2026-119618, whether the patch has been applied to running processes, and whether core site operations have been verified. If signs of interference appear, save logs before cleanup and engage a forensic specialist. The patch does not automatically resolve the consequences of a possible prior compromise.

Information verified on November 12, 2026, at 17:58 MSK. The Apache HTTP Server 2.4.71 fix was released on November 11; the exact release time is not specified in the announcement.

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