CVE-2026-34355

Publication date 8 June 2026

Last updated 20 July 2026

Ubuntu priority

Cvss 3 Severity Score

Description

A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted backend. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	26.04 LTS resolute	Fixed 2.4.66-2ubuntu2.4
	25.10 questing	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 2.4.58-1ubuntu8.15
	22.04 LTS jammy	Fixed 2.4.52-1ubuntu4.23
	20.04 LTS focal	Fixed 2.4.41-4ubuntu3.23+esm5
	18.04 LTS bionic	Fixed 2.4.29-1ubuntu4.27+esm10
	16.04 LTS xenial	Fixed 2.4.18-2ubuntu3.17+esm19
	14.04 LTS trusty	Fixed 2.4.7-1ubuntu4.22+esm14

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: d62fc37

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	7.5 · High
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-8516-1
Apache HTTP Server vulnerabilities
8 July 2026

USN-8571-1
Apache HTTP Server vulnerabilities
20 July 2026