What is CVE-2026-63686?

CVE-2026-63686 is a high-severity vulnerability in Apache Software Foundation HTTP Server, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-10-01.

How severe is CVE-2026-63686?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Apache Software Foundation HTTP Server

CVE-2026-63686

A NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an untrusted backend server to cause a denial of service via a proxied response with a charset whose conversion partially succeeds then fails. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation HTTP Server

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

httpd.apache.org/security/vulnerabilities_24.html (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-63686?: CVE-2026-63686 is a high-severity vulnerability in Apache Software Foundation HTTP Server, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-10-01.
How severe is CVE-2026-63686?: High severity. CVSS v3 base score is 7.5 out of 10.