High [CVE-2026-63292] Arbitrary code execution via oversized Host header in mod_vhost_alias
This high-severity Red Hat Linux advisory covers CVE-2026-63292; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Arbitrary code execution via oversized Host header in mod_vhost_alias. Red Hat rates this important (CVSS 8.1).
Weakness: CWE-787. Red Hat lists fixing advisory RHSA-2026:74858 with package httpd-main-2.4.69-1.hum1.
Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 3 more.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: httpd.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
- httpd-main-2.4.69-1.hum1
- RHSA-2026:74858
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability without code modifications, ensure that `LimitRequestFieldSize` remains at or below its default limit of 8190 bytes, or disable the `mod_vhost_alias` module if dynamic virtual hosting is not required. 1. Ensure `LimitRequestFieldSize` is not configured above 8190 in `/etc/httpd/conf/httpd.conf` or `/etc/httpd/conf.d/`: ``` LimitRequestFieldSize 8190 ``` 2. Alternatively, if `mod_vhost_alias` is not needed, disable it by commenting out its loading directive in `/etc/httpd/conf.modules.d/00-base.conf`: ``` # LoadModule vhost_alias_module modules/mod_vhost_alias.so ``` 3. Validate the configuration syntax and reload the service: ``` apachectl configtest systemctl reload httpd ``` Caveats: Restricting `LimitRequestFieldSize` may reject legitimate requests that carry exceptionally large HTTP headers, returning a 400 Bad Request response. Disabling `mod_vhost_alias` prevents the use of dynamic virtual host directives such as `VirtualDocumentRoot`. Warning: Reloading or restarting the `httpd` daemon may briefly affect in-flight network connections.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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