CVE-2026-43951: Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-06-11

Last Updated

2026-06-23

EPSS Score

0.55% (percentile: 43.8%)

Affected Products (1)

Other

• 21442-17084

Revision History

• 2026-06-11: Information published.
• 2026-06-23: Information published.