---
title: "CVE-2026-63686: Apache HTTP Server - Denial of Service"
description: "Apache HTTP Server < 2.4.69 contains a null pointer dereference caused by improper handling of proxied responses with partially failing charset conversion in mod_xml2enc, letting untrusted backend servers cause denial of service."
url: https://panop.io/threat-heartbeat/CVE-2026-63686/
---

# CVE-2026-63686 Apache HTTP Server - Denial of Service

Apache HTTP Server < 2.4.69 contains a null pointer dereference caused by improper handling of proxied responses with partially failing charset conversion in mod\_xml2enc, letting untrusted backend servers cause denial of service.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.48% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-63686)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

1 October 2026

Updated

15 October 2026

Weakness

[CWE-476](https://cwe.mitre.org/data/definitions/476.html)

## Vendor fix

Upgrade to version 2.4.69.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-63686](https://nvd.nist.gov/vuln/detail/CVE-2026-63686)
- [http://www.openwall.com/lists/oss-security/2026/10/01/25](http://www.openwall.com/lists/oss-security/2026/10/01/25)
- [https://httpd.apache.org/security/vulnerabilities\_24.html](https://httpd.apache.org/security/vulnerabilities_24.html)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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