CVE-2026-34355: Apache HTTP Server: mod_proxy_html buffer overflow

Published Jun 8, 2026
·
Updated

A buffer overflow in modproxyhtml 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.

Affected Software

4 affected componentsFixes available
Apache HTTP Server<=2.4.67
Microsoft azl3 httpd 2.4.67-1
Apache HTTP Server>=2.4.0<2.4.68
debian/apache2<=2.4.62-1~deb11u1, <=2.4.67-1~deb12u2, <=2.4.67-1~deb12u3, <=2.4.67-1~deb13u2, <=2.4.67-1~deb13u3
2.4.67-1~deb11u32.4.68-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/apache2 to a version that resolves this vulnerability.

    Fixed in 2.4.67-1~deb11u3Fixed in 2.4.68-1
  2. Upgrade

    Upgrade Apache HTTP Server (mod_proxy_html) to a version that resolves this vulnerability.

    Fixed in 2.4.68

Event History

Jun 8, 2026
CVE Published
via MITRE·03:20 PM
Data Sourced
via MITRE·03:20 PM
DescriptionWeakness
Data Sourced
via Red Hat·04:02 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·04:16 PM
DescriptionSeverityWeaknessAffected Software
Jun 11, 2026
Data Sourced
via Microsoft·08:02 AM
DescriptionSeverityWeaknessAffected Software
Jul 8, 2026
Data Sourced
via Launchpad·03:47 PM
Description
Data Sourced
via Debian·03:48 PM
DescriptionAffected Software
Jul 9, 2026
Data Sourced
via Ubuntu·03:48 PM
RemedyDescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-34355?

The severity of CVE-2026-34355 is categorized as risk level 55, indicating a moderate buffer overflow vulnerability in mod_proxy_html.

2

How do I fix CVE-2026-34355?

To fix CVE-2026-34355, users should upgrade their Apache HTTP Server to version 2.4.68 or later.

3

Which versions of Apache HTTP Server are affected by CVE-2026-34355?

CVE-2026-34355 affects Apache HTTP Server version 2.4.67 and earlier.

4

What type of vulnerability is CVE-2026-34355?

CVE-2026-34355 is classified as a buffer overflow vulnerability.

5

Who is at risk from CVE-2026-34355?

All users of Apache HTTP Server 2.4.67 and earlier who are exposing their server to untrusted backends are at risk from CVE-2026-34355.

Company

Resources

Contact

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