CVE-2026-43951
Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash
6.5
MEDIUM
CVSS 3.1
Description
Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
How to fix CVE-2026-43951
To remediate CVE-2026-43951, upgrade the affected package to a fixed version below.
- Bitnami/apache—upgrade to 2.4.68 or later
- Debian/apache2—no fix listed
Is CVE-2026-43951 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-43951.
Affected packages (2)
- >= 2.4.0, < 2.4.68
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| nvd | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |