Severity: low 

Affected versions:

- Apache HTTP Server 2.4.26 through 2.4.63

Description:

In certain proxy configurations, a denial of service attack against Apache HTTP 
Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients 
causing an assertion in mod_proxy_http2.

Configurations affected are a reverse proxy is configured for an HTTP/2 
backend, with ProxyPreserveHost set to "on".

Credit:

Anthony CORSIEZ (finder)

References:

https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-49630

Timeline:

2025-06-04: Report received
2025-07-07: 2.4.x revision 1927044


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