What is CVE-2026-42535?

CVE-2026-42535 is a critical-severity vulnerability in Apache HTTP Server, classified under Exposure of Resource to Wrong Sphere. CVSS score: 9.1/10. Published 2026-06-08.

How severe is CVE-2026-42535?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Apache HTTP Server

CVE-2026-42535

A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly manipulate trusted DAV property databases, potentially causing child process crashes. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

Published 2026-06-08 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Apache HTTP Server
Apache Software Foundation HTTP Server — versions 0

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

httpd.apache.org/security/vulnerabilities_24.html (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-42535?: CVE-2026-42535 is a critical-severity vulnerability in Apache HTTP Server, classified under Exposure of Resource to Wrong Sphere. CVSS score: 9.1/10. Published 2026-06-08.
How severe is CVE-2026-42535?: Critical severity. CVSS v3 base score is 9.1 out of 10.