| Package | Affected versions | Patched versions |
|---|---|---|
| http server | ≥ 2.4.26, < 2.4.64 | 2.4.64 |
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".
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