CVE-2026-119618 | Apache HTTP Server mod_http2 Race Condition Remote Code Execution Vulnerability
Apache HTTP Server mod_http2 race condition vulnerability allows RCE.
CVE-2026-119618 is a critical race condition in Apache HTTP Server's mod_http2 module, specifically within the assign_headers() function, that can lead to remote code execution. The vulnerability arises from improper synchronization of a shared resource, corrupting heap memory. Attackers can exploit this by reaching the server over HTTP/2 without requiring credentials. The vulnerability affects Apache HTTP Server versions from 2.4.55 through 2.4.70 and is fixed in version 2.4.71.
AI summary of the linked source. Not reviewed by an editor. How this works
Run Apache HTTP Server?
Get an email when a new story names Apache HTTP Server, usually within the hour.
Free. Your list stays private and never appears in a subject line. One click stops it. How Vendor Watch worksPrivacy
The lesson from this incident
Full lessonA race condition in Apache HTTP Server's mod_http2 module allows unauthenticated attackers to corrupt heap memory and achieve remote code execution simply by sending HTTP/2 requests — no credentials required. The root cause is improper synchronization of a shared resource within the assign_headers() function, a class of flaw that is difficult to detect through routine code review but devastating in production. This vulnerability affected a wide swath of Apache deployments (versions 2.4.55 through 2.4.70), meaning organizations slow to patch were exposed to full server compromise. It underscores why timely patching of internet-facing web infrastructure is non-negotiable, especially when fixes are publicly available.
What helps against this
How we list vendors- Vulnerability scanning and prioritisation
You know which systems are vulnerable, and which ones to fix first.
- Automated patch management
Known holes get closed in days, not months.
- Next-generation firewall and intrusion prevention
Malicious traffic is blocked at the network edge and between zones.
Indicators of Compromise
Extracted by AI from the linked source. Not reviewed by an editor. How this works
- cve — CVE-2026-119618