CVE-2026-43951

MEDIUM

Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash

Title source: cna

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.

References (2)

Core 2

Core References

Vendor Advisory vendor-advisory

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

Mailing List

http://www.openwall.com/lists/oss-security/2026/06/08/10

Scores

CVSS v3 6.5

EPSS 0.0053

EPSS Percentile 40.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-125

Status published

Products (2)

apache/http_server 2.4.0 - 2.4.67

Apache Software Foundation/Apache HTTP Server 2.4.0 - 2.4.67

Published Jun 08, 2026

Tracked Since Jun 08, 2026