NULL pointer dereference in Apache HTTP Server - CVE-2026-63686
Published: October 1, 2026
Vulnerability identifier: #VU153110
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63686
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in mod_xml2enc when processing a proxied response with a charset conversion that partially succeeds and then fails. A remote attacker can provide a specially crafted proxied response to cause a denial of service.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-63686
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.69