CVE-2026-43951

MEDIUM 6.5

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

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-125
Vendor	apache software foundation
Product	apache http server
Published	Jun 8, 2026
Last Updated	Jun 8, 2026

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Affected Versions

Apache Software Foundation / Apache HTTP Server

2.4.0 ≤ 2.4.67

References

NVD ↗ CVE.org ↗ EPSS Data ↗

httpd.apache.org: https://httpd.apache.org/security/vulnerabilities_24.html openwall.com: http://www.openwall.com/lists/oss-security/2026/06/08/10

Credits

Zhenpeng (Leo) Lin at depthfirst