Vulnerability · Published Oct 1, 2026 · Assigned by apache
CVE-2026-42528Apache HTTP Server: mod_dav shared lock overflow
Medium 4.3
In plain English
A medium-severity security flaw 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 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 65.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-42528 |
| Alpine:v3.22 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-42528 |
| Alpine:v3.23 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-42528 |
| Alpine:v3.24 | apache2 | 2.4.69-r0 | ALPINE-CVE-2026-42528 |
| Debian:12 | apache2 | no fix listed | DEBIAN-CVE-2026-42528 |
| Debian:13 | apache2 | 2.4.69-1~deb13u1 | DEBIAN-CVE-2026-42528 |
| Debian:14 | apache2 | 2.4.69-1 | DEBIAN-CVE-2026-42528 |
| Ubuntu:22.04:LTS | apache2 | no fix listed | UBUNTU-CVE-2026-42528 |
| Ubuntu:24.04:LTS | apache2 | no fix listed | UBUNTU-CVE-2026-42528 |
| Ubuntu:26.04:LTS | apache2 | no fix listed | UBUNTU-CVE-2026-42528 |
| Ubuntu:26.10 | apache2 | no fix listed | UBUNTU-CVE-2026-42528 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 0 – through 2.4.68 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L