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Vulnerability record · CVE-2026-34355 · published 8 June 2026

CVE-2026-34355: Apache http server heap-based buffer overflow vulnerability

Apache · Http Server

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.

7.5 CVSS 3.1 High EPSS 2.7% · top 14.9% CWE-122 · Heap-based buffer overflowCWE-120 · Classic buffer overflow
7.5CVSS 3.1 base score
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
14 Sep 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/06/08/6 Mailing List
https://access.redhat.com/errata/RHSA-2026:25042
https://access.redhat.com/errata/RHSA-2026:34109
https://access.redhat.com/errata/RHSA-2026:41906
https://access.redhat.com/errata/RHSA-2026:42828
https://access.redhat.com/errata/RHSA-2026:47046
https://access.redhat.com/errata/RHSA-2026:53371
https://access.redhat.com/errata/RHSA-2026:56868
https://access.redhat.com/errata/RHSA-2026:56869
https://access.redhat.com/errata/RHSA-2026:62165
https://access.redhat.com/errata/RHSA-2026:66323
https://access.redhat.com/errata/RHSA-2026:67152
https://access.redhat.com/security/cve/CVE-2026-34355
https://bugzilla.redhat.com/show_bug.cgi?id=2486414
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34355.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-34355), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.