Buffer overflow in Apache HTTP Server - CVE-2026-34355
Published: June 8, 2026
Vulnerability identifier: #VU133906
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-34355
CWE-ID: CWE-120
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apache Foundation
Affected software:
Apache HTTP Server
Apache HTTP Server
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to buffer overflow in mod_proxy_html when processing content from an untrusted backend. A remote attacker can operate an untrusted backend to cause a denial of service.
How to mitigate CVE-2026-34355
Install security update from vendor's website.