CVE-2026-42528

Apache HTTP Server: mod_dav shared lock overflow

MEDIUM

4.3

CVSS Score

Published: October 1, 2026 at 03:52 PM UTC

Updated: October 6, 2026 at 02:07 PM UTC

1 product affected across 1 vendorHTTP Server

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HTTP Server · Apache

95%

v ≤ 2.4.682.4.0 ≤ v < 2.4.69

Affected range stops below 2.4.69, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://httpd.apache.org/security/vulnerabilities_24.html

References (2)

Vendor Advisory

Source: cverecord

https://httpd.apache.org/security/vulnerabilities_24.html

Mailing ListThird Party Advisory

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2026/10/01/12

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: LOW

Vector?

Quick Info

StatusANALYZED

CWE

CWE-789

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