Affects Apache HTTP Server mod_dav_fs; widely deployed web server; critical DoS via property DB manipulation.
CVE-2026-42535
Apache mod_dav_fs path handling allows manipulating trusted DAV properties.
Is CVE-2026-42535 being exploited?
Not confirmed. CVE-2026-42535 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.54% probability of exploitation in the next 30 days.
How severe is CVE-2026-42535?
CVE-2026-42535 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-42535?
Yes. A fix has been recorded for CVE-2026-42535. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-42535 affect?
CVE-2026-42535 affects Apache HTTP Server (mod_dav_fs) <= 2.4.67. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-42535?
Upgrade to 2.4.68 to fix.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
WebDAV property manipulation can crash child processes, risking DoS and service disruption.
Immediate action required
- affected<= 2.4.67
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.