Concurrent Execution using Shared Resource with Improper Synchronization vulnerability in Apache HTTP Server's mod_http2 in assign_headers() can lead to RCE.
This issue affects Apache HTTP Server: from 2.4.55 through 2.4.70.
Affected releases of mod_h2 from GitHub: from 2.0.8 through 2.0.42.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 2
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Apache Http_Server
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
|
2.4.55
|
2.4.71
|
|
Icing Mod_Http2
cpe:2.3:a:icing:mod_http2:*:*:*:*:*:apache_httpd:*:*
|
2.0.8
|
2.0.42
|
References 9
https://httpd.apache.org/security/vulnerabilities_24.html
security@apache.org
http://www.openwall.com/lists/oss-security/2026/11/11/13
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https://access.redhat.com/security/cve/cve-2026-119618
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https://bugs.gentoo.org/986161
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https://bugzilla.redhat.com/show_bug.cgi?id=2567318
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https://github.com/AlmaLinux/updates/issues/4252
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https://github.com/microsoft/azurelinux/pull/20165
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https://ubuntu.com/security/CVE-2026-119618
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https://www.wiz.io/blog/cve-2026-119618-rce-apache-http-server-vulnerability
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