Heap-based buffer overflow in Apache HTTP Server - CVE-2026-34356

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Main Vulnerability Database Vulnerabilities #VU133905

Heap-based buffer overflow in Apache HTTP Server - CVE-2026-34356

Published: June 8, 2026


Vulnerability identifier: #VU133905
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-34356
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Apache Foundation
Affected software:
Apache HTTP Server

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to heap-based buffer overflow in ProxyPassReverseCookie* processing when interacting with malicious backend servers. A remote attacker can operate a malicious backend server to execute arbitrary code.


How to mitigate CVE-2026-34356

Install security update from vendor's website.

Sources