CVE-2026-42528
Apache HTTP Server: mod_dav shared lock overflow
No exploitation reported by the sources we read.
- Published2026-10-01
- Fixed in2.4.69
- WeaknessCWE-789
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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
Timeline
dates in UTC- 2026-10-0116:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-25 03:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-42528?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-42528?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.4 | ≥ 2.4.0, < 2.4.69 | 2.4.69 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
httpd: httpd: Denial of Service via mod_dav shared lock memory calculation error
httpd as a component of Red Hat Enterprise Linux 10 · httpd-core as a component of Red Hat Enterprise Linux 10 · httpd-devel as a component of Red Hat Enterprise Linux 10 · +64 more
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Fix
- Update Apache HTTP Server to 2.4.69
- Vendor fix Red Hat Product Security RHSA-2026:74858 · 23 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Workaround from the vendor Red Hat Product Security RHSA-2026:74858 · 23 productsIf WebDAV functionality is not required, disable the mod_dav module by commenting out the `LoadModule dav_module` line in `/etc/httpd/conf.modules.d/00-dav.conf` or setting `Dav Off` within the relevant configuration contexts. If WebDAV is required, restrict lock capabilities to authenticated and …
- No fix available, says the vendor Red Hat Product Security CVE-2026-42528 · 61 productsFix deferred
- No fix planned, says the vendor Red Hat Product Security CVE-2026-42528 · 6 productsOut of support scope
Advisories and patches
- httpd.apache.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- Published
- 2026-10-01
- Last Modified
- 2026-10-06
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-42528?
Is CVE-2026-42528 actively exploited?
What is the CVSS score for CVE-2026-42528?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.