Vulnerability · Published Oct 1, 2026 · Assigned by apache
CVE-2026-93546Apache HTTP Server: mod_dav_fs namespace overflow
High 8.8
In plain English
A high-severity integer overflow in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.4%top 62.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | httpd | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | httpd | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | httpd | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | httpd-core | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:9 | httpd-core | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | httpd-devel | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | httpd-devel | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | httpd-devel | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | httpd-filesystem | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | httpd-filesystem | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | httpd-manual | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | httpd-manual | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | httpd-manual | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | httpd-tools | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | httpd-tools | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | httpd-tools | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+4233+8b7d9181.7 | ALSA-2026:92616 |
| AlmaLinux:8 | mod_http2 | 1.15.7-10.module_el8.10.0+4270+e5f13fdb.7 | ALSA-2026:92616 |
| AlmaLinux:10 | mod_ldap | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | mod_ldap | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | mod_ldap | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | mod_lua | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:9 | mod_lua | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.10.0+4295+280de5aa.4 | ALSA-2026:92616 |
| AlmaLinux:10 | mod_proxy_html | 1:2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | mod_proxy_html | 1:2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | mod_session | 2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | mod_session | 2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | mod_session | 2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| AlmaLinux:10 | mod_ssl | 1:2.4.63-13.el10_2.8 | ALSA-2026:89860 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-65.module_el8.10.0+4332+2bef2e0d.13 | ALSA-2026:92616 |
| AlmaLinux:9 | mod_ssl | 1:2.4.62-13.el9_8.9 | ALSA-2026:88229 |
| Alpine:v3.21 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-93546 |
| Alpine:v3.22 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-93546 |
| Alpine:v3.23 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-93546 |
| Alpine:v3.24 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-93546 |
| Debian:12 | apache2 | no fix listed | DEBIAN-CVE-2026-93546 |
| Debian:13 | apache2 | 2.4.69-1~deb13u1 | DEBIAN-CVE-2026-93546 |
| Debian:14 | apache2 | 2.4.69-1 | DEBIAN-CVE-2026-93546 |
| Rocky Linux:10 | httpd | 0:2.4.63-13.el10_2.8 | RLSA-2026:89860 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1830+22f0c9e0 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40197+0231e209.8 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1842+4a9649e8.2 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1938+3b7755d4.3 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40206+be2c8a50.8 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40257+286895ef.9 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1984+1bed3124.4 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40312+2c72bb9b.10 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+2061+8d03fdec.5 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40402+af9563a3.13 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40045+6ce8579b.6 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+40053+5a18018e.7 | RLSA-2026:92616 |
| Rocky Linux:8 | httpd | 0:2.4.37-65.module+el8.10.0+1840+b070a976.1 | RLSA-2026:92616 |
| Rocky Linux:9 | httpd | 0:2.4.62-13.el9_8.9 | RLSA-2026:88229 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+40257+286895ef.7 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+40204+716978aa.6 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+40197+0231e209.5 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+2061+8d03fdec.4 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1938+3b7755d4.3 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1883+38ed6c58.1 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1830+22f0c9e0 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-10.module+el8.10.0+1775+6b057638 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.10.0+40053+5a18018e.2 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.9.0+1370+89cc8ad5 | RLSA-2026:92616 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.10.0+40369+03c444c1.4 | RLSA-2026:92616 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.25 | USN-8931-1 |
| Ubuntu:22.04:LTS | apache2 | 2.4.52-1ubuntu4.25 | UBUNTU-CVE-2026-93546 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.17 | USN-8931-1 |
| Ubuntu:24.04:LTS | apache2 | 2.4.58-1ubuntu8.17 | UBUNTU-CVE-2026-93546 |
| Ubuntu:26.04:LTS | apache2 | 2.4.66-2ubuntu2.6 | UBUNTU-CVE-2026-93546 |
| Ubuntu:26.04:LTS | apache2 | 2.4.66-2ubuntu2.6 | USN-8931-1 |
| Ubuntu:26.10 | apache2 | no fix listed | UBUNTU-CVE-2026-93546 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 0 – through 2.4.68 |
Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H