Skip to content
Fencer Vulns
medium 4.3

CVE-2026-42528 json

Apache HTTP Server: mod_dav shared lock overflow

published 2026-10-01 38 d ago modified 2026-10-07 32 d ago also BIT-apache-2026-42528 , EUVD-2026-90885

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

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

Patch / fix

  • bitnami apache 2.4.69
  • apache http_server 2.4.69
  • apache2 Debian 13 2.4.69-1~deb13u1
  • apache2 Debian 14 2.4.69-1

debian advisories DEBIAN-CVE-2026-42528

  • httpd hummingbird 1 2.4.69-1.hum1
  • mod_lua hummingbird 1 2.4.69-1.hum1
  • mod_ssl hummingbird 1 2.4.69-1.hum1
  • mod_ldap hummingbird 1 2.4.69-1.hum1
  • httpd-core hummingbird 1 2.4.69-1.hum1
  • httpd-tools hummingbird 1 2.4.69-1.hum1
  • mod_session hummingbird 1 2.4.69-1.hum1
  • httpd-manual hummingbird 1 2.4.69-1.hum1

red hat advisories RHSA-2026:74858

  • apache2 SLE Module for Basesystem 15 SP7 2.4.66-150700.4.26.1
  • apache2-event SLE Module for Package Hub 15 SP7 2.4.66-150700.4.26.1
  • apache2-utils SLE Module for Server Applications 15 SP7 2.4.66-150700.4.26.1
  • apache2-manual SLE Module for Server Applications 15 SP7 2.4.66-150700.4.26.1
  • apache2-worker SLE Module for Server Applications 15 SP7 2.4.66-150700.4.26.1
  • apache2-prefork SLE Module for Basesystem 15 SP7 2.4.66-150700.4.26.1
  • apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.60.1
  • apache2 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.4.66-35.84.1

suse advisories SUSE-SU-2026:5099-1SUSE-SU-2026:5077-1SUSE-SU-2026:5076-1SUSE-SU-2026:5075-1

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 2.4.69-r0

alpine advisories ALPINE-CVE-2026-42528

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd Azure Linux 3.0 2.4.69-1

azure linux advisories AZL-106773

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-42528 updated cvss 4.3

httpd: httpd: Denial of Service via mod_dav shared lock memory calculation error

  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual, httpd 2.4.63-13.el10_2.6
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +2 more Red Hat Enterprise Linux 8 httpd, mod_md, mod_ssl, mod_ldap, mod_http2, httpd-tools, +4 more Red Hat Enterprise Linux 9 httpd, mod_lua, mod_ssl, mod_ldap, httpd-core, httpd-tools, +5 more Red Hat Enterprise Linux 10 httpd 2.4.63-13.el10_2.6 Red Hat JBoss Core Services jbcs-httpd24-httpd, jbcs-httpd24-mod_md, jbcs-httpd24-mod_ssl, jbcs-httpd24-mod_ldap, jbcs-httpd24-httpd-zip, jbcs-httpd24-httpd-libs, +6 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images httpd 2.4.69-1.hum1, mod_lua 2.4.69-1.hum1, mod_ssl 2.4.69-1.hum1, mod_ldap 2.4.69-1.hum1, httpd-core 2.4.69-1.hum1, httpd-tools 2.4.69-1.hum1, +4 more
    fixed: vendor fix RHSA-2026:74858

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
38 d ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
bitnami apache
>=2.4.0, <2.4.69
2.4.69

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
  • CWE-789 Memory Allocation with Excessive Size Value
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.