CVE-2026-42528 Apache HTTP Server: mod_dav shared lock overflow

What is CVE-2026-42528?

CVE-2026-42528 is a medium-severity vulnerability in Apache Http Server, published on 1 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A memory calculation bug in mod_dav in Apache httpd 2.4.67 and earlier allows an attacker with permission to create WebDAV locks to crash server child processes.

Users are recommended to upgrade to version 2.4.69, which fixes this issue

Weakness: CWE-789

Which versions are affected by CVE-2026-42528?

1 open source package ship an affected version, including apache. It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2026-42528?

Upgrade apache to 2.4.69 or later.

Is CVE-2026-42528 being exploited?

There is no known exploitation of CVE-2026-42528 in the wild and no public exploit code.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-42528, AZL-106773, BELL-CVE-2026-42528, BIT-apache-2026-42528, DEBIAN-CVE-2026-42528, ECHO-5aa6-ecfa-0fc3 and 3 more.