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CVE-2026-34355

35
FAUCET Score

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.

First published: Jun 8, 2026Last modified: Jun 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.4.0, < 2.4.68CPE matchmatch criteria
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
>= 2.4.0, <= 2.4.67CPE match
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.09%
Probability of exploitation in next 30 days
EPSS Percentile
61.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0109 is in the 39th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

apachepatch availablevia llm_extracted
Fixed in: 2.4
ubuntupatch availablevia ubuntu_usn
Product: apache2 (focal)Fixed in: 2.4.41-4ubuntu3.23+esm5
ubuntupatch availablevia ubuntu_usn
Product: apache2 (trusty)Fixed in: 2.4.7-1ubuntu4.22+esm14
ubuntupatch availablevia ubuntu_usn
Product: apache2 (xenial)Fixed in: 2.4.18-2ubuntu3.17+esm19
ubuntupatch availablevia ubuntu_usn
Product: apache2 (resolute)Fixed in: 2.4.66-2ubuntu2.4
ubuntupatch availablevia ubuntu_usn
Product: apache2 (bionic)Fixed in: 2.4.29-1ubuntu4.27+esm10
ubuntupatch availablevia ubuntu_usn
Product: apache2 (jammy)Fixed in: 2.4.52-1ubuntu4.23
ubuntupatch availablevia ubuntu_usn
Product: apache2 (noble)Fixed in: 2.4.58-1ubuntu8.15
apachevendor investigatingvia vendor_rss
View patch

Vendor Advisories (5)

ubuntuUSN-8571-1

Apache HTTP Server vulnerabilities

Jul 20, 2026
ubuntuUSN-8516-1

Apache HTTP Server vulnerabilities

Jul 8, 2026
microsoft2026-Jun/CVE-2026-34355Moderate

Apache HTTP Server: mod_proxy_html buffer overflow

Jun 9, 2026
apacheapache:www.mail-archive.com/[email protected]/msg11209.htmlLOW

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

Jun 8, 2026
apachellm-apache-f398f8ed28802aa3LOW

Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project

Mar 2, 2026

References

access.redhat.com / errata/RHSA-2026:25042
access.redhat.com / errata/RHSA-2026:34109
access.redhat.com / errata/RHSA-2026:41906
access.redhat.com / errata/RHSA-2026:42828
access.redhat.com / security/cve/CVE-2026-34355
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-34355.json
openwall.com / lists/oss-security/2026/06/08/6
Mailing List
httpd.apache.org / security/vulnerabilities_24.html
Vendor Advisory