Medium [CVE-2026-42528] Denial of Service via mod_dav shared lock memory calculation error
This medium-severity Red Hat Linux advisory covers CVE-2026-42528; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Denial of Service via mod_dav shared lock memory calculation error. Red Hat rates this moderate (CVSS 4.3).
Weakness: CWE-131. 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
- If WebDAV functionality is not required, disable the mod_dav module by commenting out the `LoadModule dav_module` line in `/etc/httpd/conf.modules.d/00-dav.conf` or setting `Dav Off` within the relevant configuration contexts. If WebDAV is required, restrict lock capabilities to authenticated and trusted clients by limiting the LOCK method within the configuration (for example, using `<Limit LOCK>` blocks with strict `Require` directives). Apply configuration changes by reloading the service: ``` systemctl reload httpd ``` Warning: Disabling mod_dav or restricting lock operations will prevent WebDAV clients from acquiring shared or exclusive resource locks. Reloading the httpd service may briefly affect active HTTP connections.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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