CVE-2026-93546 Apache HTTP Server: mod_dav_fs namespace overflow

What is CVE-2026-93546?

CVE-2026-93546 is a high-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

Integer overflow in mod_dav_fs in Apache HTTP Server through 2.4.68 allows an authenticated WebDAV client with write access to crash worker processes and persistently corrupt a directory's property database via PROPPATCH requests declaring many XML namespaces.

Weakness: CWE-190

Which versions are affected by CVE-2026-93546?

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

Products include Apache Http Server.

How do I fix CVE-2026-93546?

Upgrade apache to 2.4.69 or later.

Is CVE-2026-93546 being exploited?

There is no known exploitation of CVE-2026-93546 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-2026-93546, AZL-106761, BELL-CVE-2026-93546, BIT-apache-2026-93546, DEBIAN-CVE-2026-93546, ECHO-4f63-6fa0-0f81 and 4 more.