High [CVE-2026-73636] Authentication bypass via credential replay in mod_auth_digest
This high-severity Red Hat Linux advisory covers CVE-2026-73636; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Authentication bypass via credential replay in mod_auth_digest. Red Hat rates this important (CVSS 8.1).
Weakness: CWE-294. 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
- Ensure that `AuthDigestNonceLifetime` is not set to `0`. If digest authentication is not required, disable `mod_auth_digest`. 1. To retain digest authentication with safe settings, set a positive non-zero value (such as the default 300 seconds) or remove the explicit zero setting from `/etc/httpd/conf/httpd.conf` or relevant files in `/etc/httpd/conf.d/`: ``` AuthDigestNonceLifetime 300 ``` 2. If HTTP digest authentication is not needed, disable the module by commenting out the corresponding line in `/etc/httpd/conf.modules.d/00-base.conf`: ``` #LoadModule auth_digest_module modules/mod_auth_digest.so ``` 3. Restart the web server to apply changes: ``` systemctl restart httpd ``` Warning: Restarting or reloading the httpd service will briefly disrupt active client connections. Disabling the module will break authentication for virtual hosts or directories relying on digest authentication.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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