The bulletin attributes CVE-2026-73637 to Apache HTTP Server's mod_auth_digest and rates it low severity. It says unauthenticated remote clients can corrupt authentication state through concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0.
Dated October 1, 2026, the publication says Apache HTTP Server versions 2.4.0 through 2.4.68 are affected on all platforms; the flaw is present before version 2.4.69. The supplied text ends before completing its upgrade recommendation, so it does not by itself confirm the maintainers' full instructions.
To assess exposure, identify the installed version and check whether the cited directives are configured. Consult the original security notice and Apache's official channels to confirm scope, the fix, and upgrade instructions before changing systems. Test changes in a controlled environment and plan deployment around service impact.
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