TechnologyThursday, November 12, 20261 min read

Critical RCE Vulnerability in Apache HTTP Server

By Hacker News · Published by Everything Blog

In short

The flaw stems from a concurrent execution issue inside the assign_headers() function during shared resource handling. Cloud monitoring data indicates that 64% of cloud environments host affected resources, with 51% having publicly accessible instances. To secure infrastructure, organizations must upgrade to version 2.4.71 or disable HTTP/2 support in favor of HTTP/1.1 until patches are applied. Although no active attacks or public exploit code have been identified yet, the severe risk of lateral movement warrants immediate remediation.

Key points

System administrators should upgrade Apache HTTP Server to version 2.4.71 or newer to ful…: System administrators should upgrade Apache HTTP Server to version 2.4.71 or newer to fully resolve the issue.
Organizations unable to apply immediate updates should mitigate risk by disabling HTTP/2…: Organizations unable to apply immediate updates should mitigate risk by disabling HTTP/2 and restricting configurations to HTTP/1.1.
Although active exploitation has not been observed, attackers could use compromised insta…: Although active exploitation has not been observed, attackers could use compromised instances to move laterally toward cloud metadata endpoints.

Sources checked by our analysis pipeline: 1

Critical RCE Vulnerability in Apache HTTP Server: Everything You Need To Know

Detect and mitigate CVE-2026-119618, a critical RCE vulnerability in Apache HTTP Server. According to Wiz data, 64% of cloud environments have resources vulnerable to CVE-2026-119618. Immediate patching is advised.

A critical synchronization vulnerability (CVE-2026-119618) has been identified in Apache HTTP Server’s HTTP/2 module (mod_http2). The flaw stems from a concurrent execution race condition within the assign_headers() function when handling shared resources. If successfully exploited, a remote, unauthenticated attacker can corrupt heap memory to achieve arbitrary code execution (RCE).

As of the time of this blog’s publication, no exploit is available and there are no reports of exploitation in the wild.

What is CVE-2026-111497?

CVE-2026-119618 is a critical, high-severity vulnerability involving a race condition in the Apache HTTP Server, which was independently discovered by Anthropic and Google Cloud’s Vulnerability Research Team.

Specifically, the flaw exists within the assign_headers() function of the HTTP/2 module (mod_http2). Due to improper synchronization when executing concurrent threads sharing resources, an attacker can trigger heap corruption. This memory corruption can ultimately be leveraged to achieve…

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Key Points

System administrators should upgrade Apache HTTP Server to version 2.4.71 or newer to ful…: System administrators should upgrade Apache HTTP Server to version 2.4.71 or newer to fully resolve the issue.
Organizations unable to apply immediate updates should mitigate risk by disabling HTTP/2…: Organizations unable to apply immediate updates should mitigate risk by disabling HTTP/2 and restricting configurations to HTTP/1.1.
Although active exploitation has not been observed, attackers could use compromised insta…: Although active exploitation has not been observed, attackers could use compromised instances to move laterally toward cloud metadata endpoints.

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AI Analysis

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In short

Key Points

System administrators should upgrade Apache HTTP Server to version 2.4.71 or newer to ful…: System administrators should upgrade Apache HTTP Server to version 2.4.71 or newer to fully resolve the issue.
Organizations unable to apply immediate updates should mitigate risk by disabling HTTP/2…: Organizations unable to apply immediate updates should mitigate risk by disabling HTTP/2 and restricting configurations to HTTP/1.1.
Although active exploitation has not been observed, attackers could use compromised insta…: Although active exploitation has not been observed, attackers could use compromised instances to move laterally toward cloud metadata endpoints.

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Technology

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Critical RCE Vulnerability in Apache HTTP Server

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