What is CVE-2026-43951?

CVE-2026-43951 is a medium-severity vulnerability in Apache Http_server, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-08.

How severe is CVE-2026-43951?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Apache Http_server

CVE-2026-43951

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.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (41.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Apache Http_server
Apache Software Foundation Http Server — versions 2.4.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

security@apache.org (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-43951?: CVE-2026-43951 is a medium-severity vulnerability in Apache Http_server, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-08.
How severe is CVE-2026-43951?: Medium severity. CVSS v3 base score is 6.5 out of 10.