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

CVE-2026-42528 is fixed in 29 products on 1 platform, first by FEDORA-2026-D3CEC01BDE, released October 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-42528
- Priority: Routine
- CVSS: 4.3 (Moderate)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 1, 2026
- Weakness: Memory Allocation with Excessive Size Value
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42528

## 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | apache2 Debian 13.5 (trixie) | 2.4.69-1~deb13u1 | [DEBIAN-CVE-2026-42528](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42528.md) | Oct 5, 2026 |
| Linux | apache2 Debian 14 | 2.4.69-1 | [DEBIAN-CVE-2026-42528](https://patchblox.com/security/data/fix/linux/debian-cve-2026-42528.md) | Oct 5, 2026 |
| Linux | apache2 sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 |
| Linux | apache2 sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | apache2-devel sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 |
| Linux | apache2-devel sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | apache2-event sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | apache2-manual sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 |
| Linux | apache2-manual sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | apache2-prefork sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 |
| Linux | apache2-prefork sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | apache2-utils sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 |
| Linux | apache2-utils sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | apache2-worker sles 15.6 | 2.4.66-150600.5.58.1 | [SUSE-SU-2026:5075-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5075-1.md) | Nov 7, 2026 |
| Linux | apache2-worker sles 15.7 | 2.4.66-150700.4.26.1 | [SUSE-SU-2026:5077-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5077-1.md) | Nov 7, 2026 |
| Linux | httpd Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-core Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-core amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-core-debuginfo Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-core-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-debuginfo Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-debugsource Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-debugsource amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-devel Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-devel amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-filesystem Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-filesystem amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-manual Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-manual amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-tools Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-tools amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | httpd-tools-debuginfo Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | httpd-tools-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_http2 amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_http2-debuginfo amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_ldap Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_ldap amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_ldap-debuginfo Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_ldap-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_lua Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_lua amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_lua-debuginfo Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_lua-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_proxy_html Fedora 43 | 1:2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_proxy_html amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_proxy_html-debuginfo Fedora 43 | 1:2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_proxy_html-debuginfo amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_session Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_session amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_session-debuginfo Fedora 43 | 2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_session-debuginfo amzn 2023 | 2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_ssl Fedora 43 | 1:2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_ssl amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |
| Linux | mod_ssl-debuginfo Fedora 43 | 1:2.4.69-1.fc43 | [FEDORA-2026-D3CEC01BDE](https://patchblox.com/security/data/fix/linux/fedora-2026-d3cec01bde.md) | Oct 5, 2026 |
| Linux | mod_ssl-debuginfo amzn 2023 | 1:2.4.69-1.amzn2023.0.2 | [ALAS2023-2026-3202](https://patchblox.com/security/data/fix/linux/alas2023-2026-3202.md) | Nov 7, 2026 |

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