Medium [CVE-2026-73637] Authentication state corruption via concurrent Digest authentication requests
This medium-severity Red Hat Linux advisory covers CVE-2026-73637; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Authentication state corruption via concurrent Digest authentication requests. Red Hat rates this moderate (CVSS 5.6).
Weakness: CWE-825. 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 issue, apply one of the following configuration options: 1. Disable `mod_auth_digest` if Digest authentication is not required: In `/etc/httpd/conf.modules.d/00-base.conf` (or the relevant module configuration file), comment out the loading of the module: ``` # LoadModule auth_digest_module modules/mod_auth_digest.so ``` 2. If Digest authentication is required, ensure vulnerable settings are disabled: Ensure `AuthDigestNcCheck` is set to `Off` (or removed, as `Off` is the default) and ensure `AuthDigestNonceLifetime` is not set to `0` (the default value is 300 seconds). After applying configuration adjustments, reload the web server: ``` systemctl reload httpd ``` Warning: Reloading or restarting the `httpd` service may briefly disrupt active client connections. Disabling `mod_auth_digest` will cause authentication failures for resources configured with `AuthType Digest`.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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