NULL Pointer Dereference Vulnerability in Apache HTTP Server by Apache Software Foundation
CVE-2026-63686

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
1 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-63686?

A vulnerability exists in Apache HTTP Server that causes a NULL pointer dereference in the mod_xml2enc module. This issue can be exploited by an untrusted backend server, potentially leading to a denial of service condition due to an improperly handled charset conversion in proxied responses. Users are strongly advised to upgrade to version 2.4.69 or higher to mitigate this risk.

Affected Version(s)

Apache HTTP Server 2.4.0 <= 2.4.68

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-63686
Created by timothyckl

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lucian Nitescu
Zhen Kong
.