CVE-2026-34355CWE-120CWE-122

CVE-2026-34355

High · published June 8, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
66.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01161 · 66.9th percentile
Weaknesses
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'); CWE-122 · Heap-based Buffer Overflow
Published
2026-06-08T20:16Z
Affected products (1)
ProductVersionsFixed in
apache/http_server≥ 2.4.0, < 2.4.682.4.68
References (16)
https://httpd.apache.org/security/vulnerabilities_24.html · [email protected]http://www.openwall.com/lists/oss-security/2026/06/08/6 · af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2026:25042 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34109 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:41906 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:42828 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:47046 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:53371 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:56868 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:56869 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:62165 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:66323 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:67152 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-34355 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2486414 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34355.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
EPSS history
Timeline
  • 08 JUN 15:20Z
    Apache HTTP Server: mod_proxy_html buffer overflow
    cvelistv5