Heap-based Buffer Overflow in Apache HTTP Server Affects Untrusted Content
CVE-2026-42536

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
8 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-42536?

A Heap-based Buffer Overflow vulnerability exists in the Apache HTTP Server due to improper handling of untrusted content when utilizing mod_xml2enc. This vulnerability can be exploited by an attacker to execute arbitrary code or crash the server, leading to potential information disclosure or denial of service. It is recommended that users upgrade to version 2.4.68 or later to mitigate this issue effectively.

Affected Version(s)

Apache HTTP Server 2.4.0 <= 2.4.67

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-2026-42536-PoC
Created by erberkan

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

Zhenpeng (Leo) Lin at depthfirst
.