Integer Overflow Vulnerability in Apache HTTP Server Affecting mod_dav_fs
CVE-2026-93546

8.8HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
1 October 2026

What is CVE-2026-93546?

An integer overflow vulnerability exists in the mod_dav_fs module of Apache HTTP Server up to version 2.4.68. This flaw can be exploited by an authenticated WebDAV client with write access, allowing the client to trigger crashes in the worker processes. Additionally, it can lead to persistent corruption of a directory's property database through manipulated PROPPATCH requests that declare an excessive number of XML namespaces. This vulnerability poses significant risks to the stability and reliability of affected Apache server environments.

Affected Version(s)

Apache HTTP Server 0 <= 2.4.68

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Zhen Kong
Calif.io in collaboration with Anthropic
AISLE in partnership with Red Hat
.